For me it runs the gamut. My favorite genres are Jazz Fusion, Blues, and Progressive Rock ala ELP or Yes. For the most part ( although not always ), when I do a blues piece, I like a simpler and less imposing drum ( and bass ) pattern, and sometimes the 2 bar loops are ok for me..but even then I prefer a longer loop that gives a slight variation from bar to bar. When I move toward more complex Progressive Rock pieces and even more so with Jazz Fusion, I sometimes favor very complex drums. In a few cases, the drummer is actually THE or one of THE featured players...( ala the styles of Billy Cobham or Bill Bruford ). In these cases, depending on the feel, I can sometimes get enough flavor in a piece by making and using several variations in my styles, and adding additional drums using the pads, but at other times it gets complex enough that I might use a style's drums as a template to begin with, and then once I have added other instruments, I go back and remove the style drummer and add real time playing or, if the drums are beyond my abilities as a "pad" drummer, drum pieces composed in Jammer Pro or Jazz sequencer.
There is no doubt though that the Korg "programmer(s)" that Dave mentions has given me a lot of good style drums to work with as templates and sometimes even finished products. I too like the way Korg in general has their rythyms set up in the styles. Finally though, I see a bit of improvement in a few of the newer Yamaha styles as well.

AJ