Yoshi is my consistent favorite. Because he belongs to the best weight class, light heavyweight, meaning he doesn't hurt for firepower and he's also tough to knock out, but he's no slowpoke. All of his basic moves are extremely strong: running + A, all C-stick/smash moves, crouch + A, regular A. His B moves are not the best, but they're not the worst either. And if there's a bad matchup for him, I haven't seen it.