you can't compare apples and oranges

Từ điển Oxford Advanced Learner 8th

you can't compare ˌapples and ˈoranges idiom
(NAmE)it is impossible to say that one thing is better than another if the two are completely different
•They are both great but you can't compare apples and oranges.
•No, you're trying to compare apples and oranges.
Main entry: ↑compare_idiom