Well Ladies and Gentlemen I am the new owner of a Rem 700 in 300WM that i am building. The overall goal of the gun is about 90% paper and steel but also being my new elk rifle. My dad has also taken quite the interest in the rifle but with his... lets say... "elevated" age and shoulder issues I would like to tame the recoil as much as possible for my pops. As far as my searching has done both are very effective brakes and seem to have the most positive reviews from first hand owners/users. Only design difference other than the muscle slabbed option, is the muscle brake having a 90 degree first port which i can see the advantage of this at the range around other shooters, but most of my shooting other than hunting is out on a friends ranch with one maybe two other fiends. Really what i'm asking with only a $20 price difference between them, if you were in my over sized shoes what would you pick?