There's a post like this a bit down the page, actually.
I listen primarily to metal and its sub-genrès, though I avoid nu-metal as I find it
dull and
repetitive lacking any real
depth.
As for my favourites, there are numerous.
Dredg is a clear favourite right now - see some samples of them
here. As for an all-time favourite, I'd have to say
Opeth, a Swedish melodic black metal band.