Who's the best of the best? New school is of course, Kyuss, Monster Magnet,Sleep, Fu Manchu, Sheavy, Dozer,Atomic Bitchwax, Orange Goblin ,Abdullah, Solarized, Spirtual Beggars and many others.
Old School? I love Hawkwind, early UFO, Night Sun, Suck, Blue Cheer, Flower Travellin' Band, Cactus, Sir Lord Baltimore, Gun and many more!