Gemini! Looks great, rides smooth, the comraderie/competition the racing aspect creates is a blast and as an older ride with two sets of tracks it's always a minimal wait. It's fun to slap hands with riders on the other train, act like you're rowing and the headchopper moment is always a nice touch. It's fun to ride again and again and I've ridden it significantly more than any other coaster.
There was a time when I would have said Magnum but on my visit this year it rode quite a bit rougher than I had remembered and just didn't have that same magical airtime.