(10) Brinstar (Melee/Brawl) vs. (11) Corneria (Melee/Brawl) (33)Mushroom Kingdom II (Melee) vs. (5) Yoshi's Island (N64/Melee)
Starting to get down to things now! The stages in the first matchup are both just decent, so it was pretty much a tossup there. Mushroom Kingdom II is one of my faves though so I'm still going with that one.
I'm actually not so surprised, people's comments on Corneria in earlier matches made it sound like a fan fave. It was actually a close battle for me and I think I would have chosen Brinstar if it were just a little larger.