apples and oranges

two people or things that are completely different from one another

The idiom "apples and oranges" originated from the comparison of two dissimilar things, specifically apples and oranges. It represents the notion of contrasting or comparing two items that are fundamentally different from each other and cannot be reasonably or fairly evaluated using the same criteria. This expression is now commonly used to highlight the inappropriateness or invalidity of comparing or equating two distinct entities due to their inherent dissimilarity.

Comparing the intelligence of dogs and cats is like comparing apples and oranges - they have different strengths and abilities.
It's difficult to compare the two novels because they belong to different genres; it's like comparing apples and oranges.
Trying to measure success based on wealth alone is like comparing apples and oranges; there are other important factors to consider.
When discussing the benefits of different exercise routines, it's essential to remember that it's like comparing apples and oranges - each has its unique advantages.
Comparing the achievements of athletes from different eras is comparing apples and oranges; the sports landscape and conditions have changed significantly over time.