I have experimented with many chicks and in the end the 9mm won for several categories
That probably was you shooting into the air New Years Eve BIL!
Mike, I have both the 9mm and 40 Shields with the Apex triggers installed and you and your bride are welcome to borrow them to see what she wants. The 9 only carries one more in the magazine and I don't notice a major difference between the two. That said, my spousal unit chose the 9 but she just learned to shoot so not the best data point. I am considering selling the 40 to keep consistent with mags and ammo.
I am not used to carrying and still prefer my 380 Bodyguard but it has the built in laser so I win with "cool kid" points.