Go to a shop or show, handle many. You will hopefully pick one up and it will feel like a great fit to your hand, it'll just feel right. Then go to a range and see if you can rent that one, or find someone who has one that you can shoot. Get a couple hundred rounds or so and put it through it's paces. With some luck, the one that feels really good in your hands will point well and impact to point of aim naturally for you. Then worry about finding the right holster for your purposes.
