If length isn't an issue, a Shield would probably be a better choice. 7 and 8 round mags come stock with the gun. The main reason to go to the G43 is that's it's smaller. I'd like to have the size advantage with the same round count.
Well, in my case, the stock grip of the 43 is just too short for me. With the Pearce +1 there is hardly any increase in length and my pinky likes it. The SI +2 extensions do add about one inch to the length but it sure feels comfortable in my hand. I think a 43 with 9 rounds should allow me to get away from most all trouble notwithstanding an IS horde in a mall.