I'm sure I've already rehashed my opinions several times, but since they tend to change a lot, here you go again!
Black and death tend to be interchangeable as my top favorites, but black (especially Norwegian) tends to be at the top most of the time. As for death, my favorites are brutal death (Floridian or NYDM being on top) and grind-flavored stuff like Carcass and Napalm Death. I also enjoy a bit of melodeath, a small portion of power metal, and some underground thrash.
That's right, I like grind, what of it?