I general I prefer fantasy. But I prefer sub genres or altered setting fantasy to tradtional high fantasy. Privateer Press, Rahkham, Hasslefree, Wargods and Celtos for exapmle all have stuff that I really dig.
I do the ocasional sci fi work, but it usually takes a reason (i.e. a contest), and I have to really like the model (i.e. usually kev whites stuff). I think a part of this is there don't seem t be as many people putting out nice original sci fi stuff as fantasy.
I also have begun doing the ocasional historical mini. I prefer non military subjets usually.