I like them both, but I must say I'm drawn to a particular setting rather than such a broad genere. I like WFRP, but not most D&D (last I played was 1st edition AD&D). I like Superhero RPGs (villians and vigilantes!!! Jeff Dee rules) ruined future (cyberpunk 2020, Gamma world) Sci fi (Robotech, WEG Star Wars).
I have to say I think in general though I prefer games that are based on skills/proficiencies rather than character levels. I think it gives you a more definable character.
RPG's I've played that I didn't like or didn't take to:
Shadowrun (introducing magic in a cyberpunk setting seems wrong somehow)
Rifts (too much mixing going on)
Star Frontiers
Twighlight 2000 (love the setting, but that game had a WAY steep learing curve)
RPG's that I haven't played but I'd like to try:
B5 RPG. no players in my area.
Traveller - cool setting, like the history aspect (can play in any time period of the imperium really) and there are many incarnations. (Gurps, D20, Mark Miller's traveller, plus previous editions)
Gurps in general - I like the concept behind the system. cyberpunk, autoduel, traveller, transhuman space are settings I have stuff for.
RPG's I haven't played and likely won't ever:
pretty much any Horror-based system. the genere just isn't for me. Including Cthuluhlu (did I spell that right?) werewolf, vampire, whatever..
the new 40K rpg, if its ever actually released.
but then thats me. :wink: