The skatebanana is the softest, then the carbon credit. Riders choice is the stiffest, and has c2 giving it a more locked in feel, while the others have btx. I have both libs tnt and sintered bases. Not a whole lot difference in speed. The sintered is harder and gets less damage and likes frequent waxing, the tnt gouges more easily but is easy to repair with ptex candles with floro inpregnated base it doesn't need or take much wax. I ride in montana and hit lots of rocks.