I have quite a few favorites, but Disturbed is at the top of my list, closely followed by Avenged Sevenfold and Korn
Liberate your mind you...well, in case i get banned, how about i don't mention the rest
I can't pick a "favourite" rock band, but my top 4 would be Pixies, The Mars Volta, Killswitch Engage, The Blood Brothers!
But like Dwarfs, i'm a big fan of Avenged Sevenfold, Korn, Disturbed, Children of Bodom, Dream Theater, At The Drive-In, DragonForce, Joe Satriani, Megadeth, Lacuna Coil, Pantera, Racer X, Sevendust, Shellac, Soilwork and well, the list goes on and on and on.
But to get back to the point, the Pixies would *probably* be my favourite out of the 4. Not for the mere sake that they've been around the longest, but because they've had such an impact on 'modern' (90's) rock music, and well, they've got an easy to listen to playing style ^^ and while songs are similar, none are really the same.