I feel like Smash's stage selection is simultaneously its biggest (possibly even only) edge over other platform fighters, but also its biggest disadvantage against traditional fighters. - like, on one hand, casual based Smash stages have way more fun layouts than casual based stages in other platform fighters, which tend to feel like an afterthought (and, well, they are most of the time!) - but on the other hand, Smash stages are usually really dull to look at, and and tend to lack a lot of eyecatching elements and setpieces, especially in the omega forms, which tend to outright remove the original casual form platforms instead of shifting them to the back as setpieces.
Compare Fighting Climax GHZ to Smash GHZ and it's pretty clear which one wins out visually - it's all the same elements from STH1, and even a very similar placement, but one is just more fun for the eyes to dart around and observe.