I didn't vote on this one, because I couldn't decide for one type alone. I think that every type has it's own advantages and disadvantages, even the normal type, that is immune to attacks from the ghost type. Of course I like the "cool" types like fire, dragon or psycho, but I also like the normal type or the stone type. The most important thing to me is if I like the pokemon itself.
The only type I don't really like is grass, because I don't really like that many pokemon with that type (except vor Bulbasaur and it's evolutions).