Looking at upper receivers and hand guards for a couple new builds and want to try something other than a URX or HK / Geissele interface. This brings me to a Zev/Triarc/SOLGW wedgelock with receiver pin versus the Larue stealth 2.0 setup. Left Hodge out of the mix as they are unobtanium at this point. SOLGW has the 6061 and 7075 wedgelock variants. Not sure what material the stealth is made from. Of these options options, which is the better, stronger, stiffer, setup and why?