never seen anyone good BMX? i work in a bike shop and we're constantly playing sick videos, so i've definitely seen some of the best riders in the world. i still think mtb is crazier. mnt bikers are going bigger and doing nearly all the same tricks as bmx riders on larger, heavier bikes with different geometry that often isn't trick-specific like bmx bikes are. look at people like Jeff Lenosky, Aaron Chase, and Darren Berrecloth (who got his start riding bmx, i know) and those guys are doing things that bmx riders are doing (and they're doing those things better than bmx riders) and they're also doing things that are impossible for bmx bikes. the room for progression and the progress that's already been made in the mountain biking world is mind-blowing. mountain biking, hands down.