I can only ACCURATELY answer OP question based on my experience. I have the BS Flatflares. IMO if you get in a lot of tight rocks or woods trees, you MAY want to look for something else.
On my '04 TJ I "almost" ripped off the passenger side flare. I did knock it loose, tore of passenger side rear view mirror, pushed the radio anntena into the windshield frame hard enough to remove paint, and have scrap marks on my hood from the tree.
Now to explain what happened so maybe you can understand the damage.....it was rainy, slick muddy hill tight area with a right hand off camber slopes to the right turn at the top.
I get to the top, start the turn, loose traction slide over and into the tree with the rock rail striking tree first. I can not go forward at all and the hill (off camber) is holding me against the tree. My only option is reverse and turn the wheels hoping that I can pull away from the tree enough to not rip everything off.
It worked kinda......only thing needed replaced was passenger side mirror. It was in 2 pieces. The scuffs on the hood windshield frame and rock rails no big deal.
Got some Black automotive trim glue and "reapplied" the front fender flare. Took longer to find the stuff than it did to glue it back on...and yes it shows it has been "tweaked" but most people wouldn't notice right away.
I like my Bushwakers...someone mentioned if I would have had hard tube fenders I would have been "fine" except all the weight and force would have been transferred to a solid object (Tube fender) instead of a flexible one. (Plastic flare)