I just think Garrett is more athletic and better built to be a game wrecker, and barnetts ability to flatten the edge is just amazing and you can't stop it. Speed rushers can be accounted for by committing to the deep drop, strong rushers can be countered with a good anchor, but if you can't get your hands into a rushers chest you simply can't block him, and that's what Barnett does, you can't deliver a punch on a chest that's damn near parallel with the field lol.
Tim Williams is far more polished than Garrett but is also slightly less of an athlete and much smaller. I think Garrett is gonna win with athleticism this year. That's my only reason for putting him a notch below those guys