Actually, I'd have to go with Gemini at CP for its all around experience.
It's fun, it's fast, and I got on it 17 times in a row once. Never a line, and although it's a shame for such a good ride to not have a line, that means more time for me, so I guess it's a good thing.
Close second would be Magnum, then probably Demon at SFGAm, for the same reasons as Gemini. No line.