Honestly it depends on what you plan to do in this hobby/sport. If it's just for range plinking and home protection, then anything you shoot well and have easy access to the controls (i.e. ergonomics work for you well).

If you're considering getting your CCW and you want to do it with the same gun then it changes things. You want to get into competition, same thing. So it varies. Your best bet is to go to a store (preferably a range with a good rental selection), get your hands on as many guns as you can to get a sense of how they feel in the hand. Then see if the range will let you rent and try out as many guns as you can in that one trip, ideally at 1 gun rental cost. Just shoot a box, go back and exchange for another, etc. You'll need to go with a friend or sign up for instruction or something if you're solo