From what i've read, the NATO length stock is generally a better fit for larger people. But, you might want to consider your intended use and location. I am currently starting on a saiga 12 conversion, my intended use for the weapon is as a whitetail deer slug gun. Since I live in Iowa and I usually hunt in layered clothing, I decided that the Warsaw length of pull was a better fit for my 12. The shorter stock should give me a decent length of pull with the added clothing bulk. I am by no means an expert, this is just my humble opinion.