Who makes the best? Any bolt on part is going to have problems becuase of the pounding recoil of a 12G. So, best, becomes a matter of price IMO. Mesa is expensive and has had its fair share of problems. Tacstar is cheap and has also had problems
In my mind it boils down to cost on a part that WILL fail no matter who makes it. (provided you actually shoot your gun)
Right now I have no side saddles on any of my guns thats just because im tired of *icking around with bolt ons.