Hard to say, as sci-fi is really just another form of fantasy that happens to take place in a futuristic setting. If I had to choose one I MIGHT say fantasy.
The only problem with fantasy though is that I feel it's stagnated terribly in the last few years--with games in particular. It seems like everything now is just that pulpy sort of Tolkien-established D&D-inspired takes-itself-way-too-seriously-despite-how-silly-it-is stuff. Even the most critically-acclaimed fantasy games just look so silly to me. Sci-fi on the other hand has impressed me more recently, in movies as well. It seems like Lord of the Rings did high fantasy on the big screen first and best and no one's even tried to top it since, and it hasn't made any sort of real progression in other media since D&D pinned its style down.
Overall I would still choose fantasy though, mostly just because the daydream of hitting stuff with a sword is still like a hundred times better and more frequent than the one of zapping dudes with ray guns and flying in ships. Just nothing cooler than swords.
Currently playing:
Bloodbath Paddy Wagon Ultra 9
