While Peach and Daisy are very different, how exaggerated and emphasized would they make her fighting animations? Realistically I don't think she'd be that bold and brash. Like I know she's a tomboy but in the Mario games her animations aren't all that wild. Still enthusiastic, but still a bit feminine.
So, what I mean by this is- if she's in her dress, wouldn't she still act the way she does in Mario games, which is happy and tomboyish but still feminine? In a dress, this would still be a bit still similar to Peach. Heck, in older games, they even shared certain running/jumping animations. They don't exaggerate her boldness other than her voice.
This is unless they actually do exaggerate her wild character more and make her more like Mario Strikers while putting her in a dress, similar to how Mario is exaggerated to be more serious and Luigi to be more strange and silly. That would be a great contrast. But if they don't do that, then she'd be super similar to Peach in appearance. That's why option two is the sports outfit.
I don't think the sports outfit is generic like a fighting suit or something that a female hero wears to be a typical badass, since it's very colorful, and also includes her crown and big earrings which I find to be an elegant touch to it. What I do find generic is when I see fanart of Daisy in her sports outfit and they remove either her earrings, flower collar or crown (a big no no in my book lol).
Some sporty Daisy art I did a while back!
https://plantasteroid.deviantart.com/art/SMASH-5-735081148