Against Samus, also DO NOT go to Stadium, I've made that mistake in tournament. It is too large and you will get missile spammed with the platform placement.
I'd also consider avoiding Yoshi's against a Samus so they don't get any lucky early missile kills.
Fountain is known for being a good stage for Samus, and you kind of do want platforms to escape, so the only stage left for Samus is... Battlefield. It is also more difficult for her tether shenanigans on Battlefield.
So, for Samus, I'd say Battlefield. Dreamland is okay but it is also large so she will live forever.
For Peach, I'd say Yoshi's can be good because just 2 Bairs off stage and she is pretty much in the blastzone, and if she floats over you, Uair will kill very early too. Look out for your head poking through platforms into Dsmash though.
So, for Peach, I'd say whatever you are comfortable with, although similar Dreamland tradeoffs as Samus.
Luigi is a bit different than the other 2. I wouldn't go Yoshi's, it feels very cramped due to Luigi's movement options. I have had experience with a local Luigi always SD'ing on this stage though, the ledges seem to annoy him and the bottom is shallow.
FD is bad. You want platforms.
So, for Luigi, I'd say Dreamland has advantages to you but not any for him. You can live a very long time and he will have trouble chasing and killing you vertically. FOD can mess up his recovery sometimes as well.