this post is discussing "easier to read" topic.
Is "have greater readability than" or "easier to read than" not idiomatic?
Appending to this sentence, Which following one is more appropriate?
expression_1 Is "have greater readability than" or "easier to read than" not idiomatic, or both?
expression_2 Is "have greater readability than" or "easier to read than" not idiomatic, or neither?
according to the context, at least one of them is not idiomatic.
If you're assuming that one of the phrases is not idiomatic and both might not be idiomatic, then you would say
Is 'have greater readability than' or 'easier to read than' not idiomatic, or both?
It would be even better to repeat the question to make it more clear.
Is 'have greater readability than' or 'easier to read than' not idiomatic, or are both not idiomatic?
If you want to use 'neither' instead of 'both', then you don't need the word 'not' for negation. 'Neither' is the negating word. So you could say
Is either 'have greater readability than' or 'easier to read than' idiomatic, or is neither?
Just so you're aware, both phrases are idiomatic, although 'easier to read' is plainer and more accessible to many speakers.
