There is a confusing rule I've learnt from books and teachers, i.e. the superlative form of an adjective that only has one syllable or two syllables has to end with a suffix "-er" instead of adding "more" in the front, but in this case that in the question I'm going to ask, I wonder if there is an exception, I also want to tell first that I'm not entirely sure whether or not this is a superlative form.
The film was more cool than boring.
I'm trying to construct a sentence that contains two adjectives, where the first adjective corrects the second adjective that describes the subject being introduced. I hope that makes sense. But I'm not sure either if it's supposed to be written this way:
The film was cooler than boring.
From my basic knowledge, on the other hand, I don't think it's a superlative form so I don't need to follow the gramar rule I mentioned in the first paragraph above. I also try to rearrange this way but it doesn't sound nice to my ear:
The film wasn't boring, but it was rather cool.
Could you tell if those sentences arw natural or not? Also, what is your suggestion writing to make it sound good?