My favorite genre of rock is progressive by far. Of course, there are so many prog subgenres that thats a little bit a generalization (I don't particularly like progressive metal, speaking in general) and a lot of my favorite bands have since , unfortunately, gone more towards mainstream rock. My favorite groups are, in no particular order:
Yes
Gentle Giant
Genesis
Kansas
Spock's Beard
Jethro Tull
Queen
to name a few. I love the beautiful, elaborate, and complex musical textures these bands often produce, often involving heavy counterpoint and other such devices. Even though 70s Queen is really only part progressive, they're still my favorite band, or at least my second favorite.
So yeah, I like rock a lot, but especially progressive,
-Landon
EDIT: More of the Giant
On Reflection - Really Beautiful Song
Excerpts from Octopus - Contains one of my favorite acoustic parts of all time + a madrigal (how often do you see that in rock?)