I enjoy both, they're two sides of the same coin, but I've just read more Science Fiction that totally blew me away and kicked my ass like Hyperion and A Canticle for Liebowitz. The Dune series is also really close to my heart, I honestly thoroughly enjoyed all six books (refuse to touch the son's stuff, though).

It might change soon as I read more fantasy nowadays. I've read A Song of Ice and Fire twice, I'm currently going through Lord of the Rings, and started a little bit of The Prince of Nothing which I'm getting to next, which also seems pretty insane.