I really like chips. I also really like pizza! I voted for chips though, because when I have the munchies, I go for something salted like potato chips or a cracker like Ritz.
As for ice cream ... nom. I most like the Ben & Jerry's Chocolate Fudge Brownie or the Cheesecake Brownie. As for Chocolate vs Vanilla -- in addition to what Sky says, I think it depends on who makes it? Real vanilla tastes a lot different from real chocolate. By the time so much sugar is added, though, maybe they are pretty much the same?
Re: Chocolate and Vanilla (and Strawberry)- Quote from Good Omens by Terry Pratchett and Neil Gaiman