I tend not to generalise with genres. For example, some metal, like System of a Down or Rammstein, is good, some, like Murderdolls, is very, very bad. Some hip-hop, like Rage Against the Machine, is good, some, like anything else, is bad.
If I had to choose, I'd say I like metal and rock. I'm not going to be too specific- all this Doom Metal and BlackDeath Metal and MegaDarkBlood Metal crap is just annoying and confusing.