I wouldnt know which is stronger but i had a dg on my blaster and it seemed pretty strong and very lightweight. I have an AC racing bumper on my 400 and it seems to be made better than dg
you don't want a really strong bumper or a grab bar for that matter. The bumper is whats going to take the force of whatever you hit. Its better to bend or break a bumper then have it survive only to find out your frame is bent