I tend to prefer sparkles most of all. I also have a soft spot for a good satin flame. I really like the way both of these look under lights.
I also dig a lot of the classic wraps (WMP, most stratas, some of the oysters, etc)
I don't care for solid lacquered colors much, but I'm neutral on piano black and white, probably because they're neutral themselves.
Solid wood can look great, of course depending on grain and quality of the finish. Generally I prefer something not too light of a tone, unless it has really strong grain, nor anything too dark where you can't really see the grain. Not so much a fan of the segmented look either. Also, as much as I love the look up close, more often than not I'm not so impressed with how they look on stage.
Bursts I generally turn my nose up to. Even in the same color scheme, I prefer a fade, which is still not my favorite. I think they throw off my sense of symmetry. Maybe that's not even the right word, perhaps it's more that I think they make the kit look unbalanced somehow.
None of these are rules as much as they are tendencies. There are plenty of exceptions to be made.
Specific finishes that have caught my eye in recent years and really made me do a double take: Tama's Black Clouds and Silver Linings and Ocean Blue Ripple Lacquers, Pearl's Black and White Oyster wrap (aka the Bo Eder Zebra), and many of the graffiti finishes from Oriollo (especially with the clearcoats)