Naturally I want to say Twisted Colossus because it is my favorite coaster at SFMM, which I visited two weeks ago, but I had an absolutely amazing midnight-ride on X2 that honestly made me question if I prefer it to TC (I think I do). The ride is still a hit or miss for me but recently I have had great rides on it and it is still one of the best first drops, if not the best, that I've ridden.
It could be because we were very tired and it was our last ride after a long, tiring day, so everything felt wilder than usual, but the last row on that coaster is always absolutely nuts in the best way possible.
Steel: 176 / Wood: 32 / Total: 208
Home Parks: Knott's (when home), Lagoon (at school)
Favorite Coaster: Intimidator 305