I can't judge the SW990 as I've no experience with one but I had a Sigma (which I traded) and have an M&P. The M&P is WAY above the Sigma for quality and trigger pull. The Sigma is a functional gun, a tool and no more. The M&P is a joy to own and shoot.BFIBri said:between the M&P, Sigma and the SW990? WHich onw is better than the other?