I like them all. There are times when I want to just play straight through a game, like Castlevania 1,3,4, or Rondo of Blood and times when I feel like leveling up and equipping items and I'll play Symphony of the Night, and when I feel like I want to just get really involved in beautiful scenery and music and I'll play Lords of Shadow 1.
If I had to pick a definite favorite, I'm not sure. I guess, classic then, Lords of Shadow, then metroidvania only because sometimes filling out that map and checking every nook and cranny seems like i chore and I just want to whip stuff.