Been a .40 advocate since the early 90's when our department issued the Glock 22. I LOVE it! But the first time I fired a .357Sig I said I have got to get me one of these. It is a nice option to have both. I will not give up either one. But if I could only choose one, it would have to be the .40 because of availibility of ammo in my local. I suggest getting the extra, barrel it is cheaper than an extra gun...and you will enjoy it