Pearl Jam has been my favorite since Ten came out in 1991.
Some other favorites: Dave Matthews Band, Incubus, Foo Fighters, Nirvana, Rage Against the Machine, Live, Modest Mouse, Audioslave, Soundgarden, Alice in Chains, Red Hot Chili Peppers, U2, Nine Inch Nails, Radiohead, Coldplay, Stone Temple Pilots, Led Zeppelin, The Beatles.....