The first thing you need to do is to get some 115, 124 and 147 grain rounds and see which ones stay on target better for you.
Practice a lot, shooting one-handed with both hands. Some right-handed folks can snap-shoot better with their left hand. I don't know why that is. But practice will keep you from shooting right past your target, or fumbling with your grip while the target moves against you.
Then you need to consider likely scenarios for your use of the pistol. If you are going to be robbing 7-11's, you would favor a lighter, faster bullet for maximum cashier damaging face-work at very close range. If you are going to be carjacking or shooting through bedroom or bathroom doors, you want to go for the penetration of a heavy bullet. If you are planning on doing point-blank execution type work, you can use whatever you like, bring a hat, and shoot through the hat to minimize backsplatter. Be careful when approaching downed targets, blood is very slippery.
If you use friction tape on the gun, make sure that you can still read the Grip Zone instruction, because you don't want to grab the wrong end and try to beat somebody to death with a plastic gun. The lawyer who figured that out for SA deserves a medal.