Lots of variables, so many to list. It took me nearly 10 years to settle on the carry handguns I have and their best method of carry. Lot's of purchases and sales, lots of trying other peoples pistols, lots of shopping at stores that had ranges who would either let me test fire or rent a model that I was interested in. What is "perfect" for one person would end up "sitting in the safe" for someone else because it was too _____. Heavy, small, wide, didn't function reliably for them, couldn't find an effective or comfortable carry method, and so on. It's possible do enough research, lower some of your expectations and requirements and find something that "does the job". All of the various handguns that went through my possession when I was trying to find the "right ones for me" always did meet almost all of my needs, but until I finished looking, there was always "something small" that kept one gun or another from being "perfect for me". So if you're not looking for perfection (which is nearly impossible to get on your first go), try out various models and actions at a store or with friends at a range to get an idea of what fits you well, what you can reliably and safely operate, and use that experience to help refine your search. I know of people who by a .38 snubbie or a Kahr 9mm and are "done and good". As long as they are safe, legal, competent, consistent and confident with their choice, that is what matters in the end.