The main difference between Trex Select Railing and Trex Enhance Railing is that Trex Select is not a true 6' or 8' (actual lengths are 67.5" and 91.5" respectfully), while Trex Enhance is a true 6' (72") and 8' (96"). Trex Enhance is not available in 8' stair applications, but Trex Select is. As far as appearance, Trex Enhance Railing and Trex Select Railing are identical because they consist of the same components. We only sell Trex Select railing, as Trex Enhance Railing is sold by larger box stores.