I am probably more comfortable with the Glock than the M&P in that class or type of pistol. Probably has to do with availability of parts and the fact that I have attended the Glock Armorer's Class a great many times (they want you to take it every 3 years). So, I am used to them. That said, I positively would not own that awful RTF finish Glock (too sharp) and I do not care for the Gen 4 Glocks. Thus, I am stuck with the Gen 3 type and for what it is, it is fine. In addition to parts availability and ability to service my own pistol, Glock magazines are not as expensive and their sights are not seemingly "welded" on the slide, making replacement with the sight tools a breeze.