Ive ridden both these frames, and i have to say they are both lush. Firstly the echo was so comfortable, i felt like i could tap for england and sidehop ok too. This has a low bb hight compared to most frames nowerdays (makes it very hoppable) Then the Adamant. This frame/Bike was amazing it just went for miles longer than any other stock (gaps, taps, sidehops ect..). The adament has a relatively low bb hight if thats what you like. In my opinion the Adamant takes it, just because it rode nice and it has more pimp factor. Thanks