to the OP, I have all models and can carry all of them in an AIWB holster. It all depends on the way you want to dress. The bigger the grips, the baggier the shirts need to be, plain and simple. You have to dress around what firearms system/model that best fits your needs. Which ever gun points and shoots the easiest for you is the gun for you. Then you dress around the gun of your choosing. I think AIWB fits many different style guns, grips and barrel lengths however many folks do not like that style of carry but it works for me. I am 5'6 and 140 lbs and can easily carry the 19X or 45 if I want, and actually yesterday I did with my 19X. First, pick the gun that best fits your hand/needs and the dress around the gun!!!!