I personally like Link in this game. He's just easier to use and his attacks are much better. In Melee, I couldn't use him at all, so I stuck with Dr. Mario. Lucas is also a good choice. His attacks can be a bit annoying if you are the one getting hit but he's good to use. Snake is awesome. I finally figured out how to do the Mortal Shell trick and it's quite useful. I guess some other good choices would be Fox, Ike, Mr. Game & Watch, Ganondorf, Toon Link, Jigglypuff (seriously). That's about it.