I'm looking to buy a new Glock and I have it narrowed down to these two calibers in a Glock 20 or 31. It will mostly be a range gun and may get put in the truck or on the nightstand fo HD. A friend of mine has a .357SIG and I loved it from the first time I shot it. I have also shot a 10mm and I swore it was the next gun I would buy. I know that the ammo for each can be hard to find and a little costly to shoot. I carry a Glock 21 on duty so I can use all the gear I already use if I wanted to carry the 20. I want some opinions on which one I should get. Both are pretty hot rounds and that is why I like them both. If I could I would just buy both and be twice as happy but the wife put an end to those thoughts the first time I brought it up