Free For All(s).
They weren't freezes, just disconnects 'cause my internet's bein' ass as of late... MR can attest t' that bein' true, what with our lagfests. Well, there was one freeze, but that wasn't 'cause of a stage I chose. I've already narrowed down which stages I like and keep said stages only for my random stage select. None of 'em ever freeze on me.
... I sorely wish Metal Caverns 'n Dracula's Castle wouldn't freeze. Good stages they are.