My current favorite is Brawl i'd have to say, only for its online play and huge roster.
But all in all, I liked the classic N64 SSB... I used to play that alot, and its so simple and fun.
With Melee, i played that for Days, like, so much that the disk got ruined from being played so much and the case broke from being opened and close so much. And with Brawl.... Jesus motherfucking christ, brawl.... I beat that game 100%, no joke. Like, to the limit of logging in over hundreds of hours in gameplay, not idle. And i even went the the extreme of getting 99 of each stickers n trophys, all CD's, all of those blue cases with out hammers, all events, every mission beat in every difficulty... Man. Obsessed with that shit, i was. The only downside is i fucked that disk and my wii by playing it so much. My wii wont read any SSBB disk anymore lol.
In SBB I dominated with Ness and Fox
SSBM was Ness, Game & Watch, And Falco
And SSBB is Ness, Lucas, Falco, and Toon Link.
Super Smash Bros has to be my favorite videogame series ever, and nintendos best by far.