Well, I've been through a lot of metal genres, I don't have a favorite one. When I was in high-school I was listening to Iron Maiden, Judas Priest, Metallica, Pantera, Sepultura, Megadeth and Anthrax. And, yes, Mr. Bungle. Those were my die-for-bands. Later I got into a clique that was really into KoRn and nu metal, so I kind of got myself dreadlocks and added some variety to my list, Coal Chamber, Mudvayne, Faith No More, RATM etc. I also started with Sonata Arctica and Nightwish, that grew very dear to me.
Well, after that, I had a break with metal for a while, exploring classical and dubstep / electro, but I wanted to reignite my love for metal with exploring what death metal and black metal got to offer. Also at the time folk metal was starting to be popular. So, it's, right now, kind of hard to say what I listen to. I'm really into black metal lately, Burzum and Immortal especially.
I also like to explore the weird side of metal, like slamming brutal death metal...
But, if you would ask me what my favorite modern metal bands right now are, I'd have to say Gojira, Ghost and Mastodon. I somehow feet that they really added something new to the genre...