If you have acess to both, try this. With your eyes closed pick up one of the guns and hold it in firing position. Then open your eyes and check the sight alignment with your natural grip. Then do the same thing with the other one. The one that comes closest to a natural sight alignment is the one that fits you best. Makes shooting accurately, and speedily a good deal easier.
This is probably the one to buy.
This is the way I do it, and have never regretted it.