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You've asked two questions in one.

First, horror cannot be used with the -er/-est comparative suffixes; native speakers would only ever use more and most. This is simply because horror has more than one syllable. There are a whole bunch of exceptions both ways (see the discussion in the comments and this more thorough explanation on Wikipedia) but the basic principle is that the comparative suffixes are primarily used with single-syllable words of Germanic derivation, while more and most are primarily used with many-syllable words of Latin derivation.

Second, more horror is not how a native speaker would compare the grade of horror in two works of fiction -- this movie didn't scare you much at all, that movie scared you a lot more. Instead, we would say one was more horrifying than the other. And one particular movie might be the most horrifying movie you have ever seen.

The logic behind this word choice is: you're describing something the movie did to you (it induced the emotion of horror) and you're comparing how effectively it did that. The movie did something, so that requires a verb, specifically the -ify verb form of the induced state. Then you convert the verb back into an adjective with -ing to make it an intrinsic quality of the movie, and now it can be compared to the same quality in other movies. (We still can't use -er/-est, because horrifying has even more syllables ... except that *horrifyingest has so many stacked suffixes that I can imagine someone intentionally using it, for effect.)

More horror is also something native speakers might say, but it means something different and is used with different main verbs. If I say movie A has or contains more horror than movie B, that means more of the time of movie A is spent on storytelling elements that are typical of the horror genre; this might or might not correlate with movie A being more horrifying (perhaps A has so much horror in it that it goes over the top (sense 2) and becomes ridiculous).

(Boldface: emphasis. Italics: mention, not use. Leading asterisk: marks descriptively-incorrect construct.)

(More horrorshow means something completely different.)

You've asked two questions in one.

First, horror cannot be used with the -er/-est comparative suffixes; native speakers would only ever use more and most. This is simply because horror has more than one syllable. There are a whole bunch of exceptions both ways (see the discussion in the comments and this more thorough explanation on Wikipedia) but the basic principle is that the comparative suffixes are primarily used with single-syllable words of Germanic derivation, while more and most are primarily used with many-syllable words of Latin derivation.

Second, more horror is not how a native speaker would compare the grade of horror in two works of fiction -- this movie didn't scare you much at all, that movie scared you a lot more. Instead, we would say one was more horrifying than the other. And one particular movie might be the most horrifying movie you have ever seen.

The logic behind this word choice is: you're describing something the movie did to you (it induced the emotion of horror) and you're comparing how effectively it did that. The movie did something, so that requires a verb, specifically the -ify verb form of the induced state. Then you convert the verb back into an adjective with -ing to make it an intrinsic quality of the movie, and now it can be compared to the same quality in other movies. (We still can't use -er/-est, because horrifying has even more syllables ... except that *horrifyingest has so many stacked suffixes that I can imagine someone intentionally using it, for effect.)

More horror is also something native speakers might say, but it means something different and is used with different main verbs. If I say movie A has or contains more horror than movie B, that means more of the time of movie A is spent on storytelling elements that are typical of the horror genre; this might or might not correlate with movie A being more horrifying (perhaps A has so much horror in it that it goes over the top (sense 2) and becomes ridiculous).

(Boldface: emphasis. Italics: mention, not use. Leading asterisk: marks descriptively-incorrect construct.)

(More horrorshow means something completely different.)

You've asked two questions in one.

First, horror cannot be used with the -er/-est comparative suffixes; native speakers would only ever use more and most. This is simply because horror has more than one syllable. With a few exceptions (see discussion in comments), the comparative suffixes can only be used with single-syllable adjectives. (This rule is asymmetric: more and most usually can be used with single-syllable adjectives.)

Second, more horror is not how a native speaker would compare the grade of horror in two works of fiction -- this movie didn't scare you much at all, that movie scared you a lot more. Instead, we would say one was more horrifying than the other. And one particular movie might be the most horrifying movie you have ever seen.

The logic behind this word choice is: you're describing something the movie did to you (it induced the emotion of horror) and you're comparing how effectively it did that. The movie did something, so that requires a verb, specifically the -ify verb form of the induced state. Then you convert the verb back into an adjective with -ing to make it an intrinsic quality of the movie, and now it can be compared to the same quality in other movies. (We still can't use -er/-est, because horrifying has even more syllables ... except that *horrifyingest has so many stacked suffixes that I can imagine someone intentionally using it, for effect.)

More horror is also something native speakers might say, but it means something different and is used with different main verbs. If I say movie A has or contains more horror than movie B, that means more of the time of movie A is spent on storytelling elements that are typical of the horror genre; this might or might not correlate with movie A being more horrifying (perhaps A has so much horror in it that it goes over the top (sense 2) and becomes ridiculous).

(Boldface: emphasis. Italics: mention, not use. Leading asterisk: marks descriptively-incorrect construct.)

(More horrorshow means something completely different.)

You've asked two questions in one.

First, horror cannot be used with the -er/-est comparative suffixes; native speakers would only ever use more and most. This is simply because horror has more than one syllable. There are a whole bunch of exceptions both ways (see the discussion in the comments and this more thorough explanation on Wikipedia) but the basic principle is that the comparative suffixes are primarily used with single-syllable words of Germanic derivation, while more and most are primarily used with many-syllable words of Latin derivation.

Second, more horror is not how a native speaker would compare the grade of horror in two works of fiction -- this movie didn't scare you much at all, that movie scared you a lot more. Instead, we would say one was more horrifying than the other. And one particular movie might be the most horrifying movie you have ever seen.

The logic behind this word choice is: you're describing something the movie did to you (it induced the emotion of horror) and you're comparing how effectively it did that. The movie did something, so that requires a verb, specifically the -ify verb form of the induced state. Then you convert the verb back into an adjective with -ing to make it an intrinsic quality of the movie, and now it can be compared to the same quality in other movies. (We still can't use -er/-est, because horrifying has even more syllables ... except that *horrifyingest has so many stacked suffixes that I can imagine someone intentionally using it, for effect.)

More horror is also something native speakers might say, but it means something different and is used with different main verbs. If I say movie A has or contains more horror than movie B, that means more of the time of movie A is spent on storytelling elements that are typical of the horror genre; this might or might not correlate with movie A being more horrifying (perhaps A has so much horror in it that it goes over the top (sense 2) and becomes ridiculous).

(Boldface: emphasis. Italics: mention, not use. Leading asterisk: marks descriptively-incorrect construct.)

(More horrorshow means something completely different.)

You've asked two questions in one.

First, horror cannot be used with the -er/-est comparative suffixes; native speakers would only ever use more and most. This is simply because horror has more than one syllable. With rare exceptions, the comparative suffixes can only be used with single-syllable adjectives. (This rule is asymmetric: more and most usually can be used with single-syllable adjectives.)

Second, more horror is not how a native speaker would compare the grade of horror in two works of fiction -- this movie didn't scare you much at all, that movie scared you a lot more. Instead, we would say one was more horrifying than the other. And one particular movie might be the most horrifying movie you have ever seen.

The logic behind this word choice is: you're describing something the movie did to you (it induced the emotion of horror) and you're comparing how effectively it did that. The movie did something, so that requires a verb, specifically the -ify verb form of the induced state. Then you convert the verb back into an adjective with -ing to make it an intrinsic quality of the movie, and now it can be compared to the same quality in other movies. (We still can't use -er/-est, because horrifying has even more syllables ... except that *horrifyingest has so many stacked suffixes that I can imagine someone intentionally using it, for effect.)

More horror is also something native speakers might say, but it means something different and is used with different main verbs. If I say movie A has or contains more horror than movie B, that means more of the time of movie A is spent on storytelling elements that are typical of the horror genre; this might or might not correlate with movie A being more horrifying (perhaps A has so much horror in it that it goes over the top (sense 2) and becomes ridiculous).

(Boldface: emphasis. Italics: mention, not use. Leading asterisk: marks descriptively-incorrect construct.)

(More horrorshow means something completely different.)

You've asked two questions in one.

First, horror cannot be used with the -er/-est comparative suffixes; native speakers would only ever use more and most. This is simply because horror has more than one syllable. With a few exceptions (see discussion in comments), the comparative suffixes can only be used with single-syllable adjectives. (This rule is asymmetric: more and most usually can be used with single-syllable adjectives.)

Second, more horror is not how a native speaker would compare the grade of horror in two works of fiction -- this movie didn't scare you much at all, that movie scared you a lot more. Instead, we would say one was more horrifying than the other. And one particular movie might be the most horrifying movie you have ever seen.

The logic behind this word choice is: you're describing something the movie did to you (it induced the emotion of horror) and you're comparing how effectively it did that. The movie did something, so that requires a verb, specifically the -ify verb form of the induced state. Then you convert the verb back into an adjective with -ing to make it an intrinsic quality of the movie, and now it can be compared to the same quality in other movies. (We still can't use -er/-est, because horrifying has even more syllables ... except that *horrifyingest has so many stacked suffixes that I can imagine someone intentionally using it, for effect.)

More horror is also something native speakers might say, but it means something different and is used with different main verbs. If I say movie A has or contains more horror than movie B, that means more of the time of movie A is spent on storytelling elements that are typical of the horror genre; this might or might not correlate with movie A being more horrifying (perhaps A has so much horror in it that it goes over the top (sense 2) and becomes ridiculous).

(Boldface: emphasis. Italics: mention, not use. Leading asterisk: marks descriptively-incorrect construct.)

(More horrorshow means something completely different.)