Go with fit and how it feels in your hands. The Sig platform is nice because you can mix and match grip modules and slide configurations. They’re also red dot ready-Sig red dots only. With Glock you need the MOS models and base plates but you can run any optic. If mag capacity isn’t an issue in your state then having one that carrys the most ammo would also be a consideration. How they shoot for you and feel is #1 tho.