I enjoy all three! But I had to choose one, so I chose the one that I drink most, which is coffee. I'm in university, okay? I try to use coffee only for "medicinal purposes" (i.e. if I need to stay up to work/study), but I guess I need that medicine more often than I get the chance to drink hot chocolate or tea!
I never drink straight coffee though. I only drink snobby designer coffee with Italian names. My favourite coffee was the vanilla fudge brownie latte from Second Cup, but they replaced it with some other junk that isn't nearly as good. Their new maple latte is pretty good I guess.
As for tea, I take it with a TON of milk and sugar.
Unless it's Japanese green tea, which is my favourite. It tastes like forest.