ive shot the SIG and it is a very nice gun. It fit nice as well. I know a lot of guys that like glocks. personally I don't. They don't fit as comfortable in my hand as the sig or berettas do. But for the price and since those are the 2 your lookin at getting I would say go with the SIG. .45 is a great cal. and SIG made it work pretty good in that model the P220. I don't know what your budget is but if you can shop around local dealers near you and find a beretta px4, GET IT! that is hands down my fav pistol to date.