So while I was in college I became fond of modern artafter some in-depth study, realizing it wasn't just crap and shit some art student threw together with various
household objects (although one could pass something off as a Pollock). Everyone always seems to enjoy works by Warhol, however I'm partial to Chuck Close.
I think he has more talent with super-realism paintings that resemble photographs. Andy Warhol just came up with a good idea of using everyday images repeatedly.
It's fair to say I enjoyed the modern art museum better, however I do appreciate the fine art (I've just seen it before in classier, European museums).
For anyone looking for free museums in SF: http://sanfrancisco.about.com/od/museums/ss/freemuseumdays_3.htm