I own a full size P320 in .45 ACP and a compact P320 in 9 mm. But I have also purchased a carry model grip module and 3 of the 17 round magazines for it (which can also be used with the compact grip module and could be carried as extras). So in effect, I have a full-size, a carry, and a compact model.
IMO the carry model is a very good choice, especially for those with larger hands. The difference in overall height between the carry and compact grip modules is only .2", less than 1/4", so the difference in concealability is not very great. With my hand size, I can get all my fingers on the compact grip with reasonable comfort, but the flesh of my fifth finger overhangs the end of the magazine well slightly and I am at risk of pinching myself with a rapid magazine change. The .2" also buys a 2 round additional magazine capacity, and I can very comfortably get all of my hand and finger flesh on the grip without fear of compromising a magazine change.
As for the full-size versus carry model choice, I have seen quite a few comment that the full-size P320 feels top heavy, although I don't personally appreciate that. The compact/carry models give up just over 3/4" in slide length and barrel length, but I do not feel that the difference in sight radius compromises accuracy to a very great degree, at least not at typical self-defense handgun ranges and not in my hands. And the shorter slide and barrel length does provide a 3 ounce weight reduction.