Well the opie is built for jumping , its a solid bike , i own the 4300 disc and have put it through a fair bit of beatings and his hasnt givin me any problems. I have a buddy i ride with who owns the giant and he had to replace the fork and back rim after 3 weeks of riding. He rode it pretty hard though , more than that bike was meant to do i belive.
All 3 are are solid bikes , if i was to pick one it would be between the 4300 and the opie .