The Bro-Tek seems like the most robust (I have not seen one 'in person') What turned me off was it was bolted on and that meant unbolting it. I have enough machines with skid plates that have to be unbolted for a oil change.
I have the BX-Expanded. Install consisted of two bolts with spacers. The spacers were junk and I replaced them with more robust ones. The skid plate 'hooks' onto the spacered bolts and the other end, attached to MMM hangers. To install, you 'lower the mower', hook the front of the plate on and clip in the back. Raise the 'mower', set the grass height to 'Top' (to keep it from lowering accidently). Once installed, it takes one minute to remove, one minute to put back on, no more effort than checking the oil.
While I imagine the Bro-Tek would fair much better than the BX-Expanded if I slammed into a rock, to do that I'd have to be pretty careless. A tractor is not a dirt bike or rock crawling Jeep. I have already high sided my tractor in dirt/mud, the skid plate showed no evidence other than a little dirt on the inside. It was a 'real world' test and performed as desired.