I don't have a favorite, but right now I'm into Silent Civilian, and my list of bands i listen to the most
-Silent Civilian < awesome, if you like good rock, listen to them
-Bullet for my Valentine < Recommend them for Rock lovers
-Lamb of God
-Mushroom Head <
And for my slow rock groups, or not as 'heavy'
-Adema, the old singer, sings Blame me, promises, etc.
-Red Hot Chili Peppers
-OLD Staind, nothing new.
-3 Days Grace < (meh, there in the middle of hard and slow)