Although I personally own M&P 22, I would recommend SR22 for smaller hands.
When I compared SR22 to M&P 22, that was the deciding factor, SR22 just felt too small for me. I know it comes with changeable grip, but it still felt quite small to me.
I'm extremely happy with my purchase, M&P 22 is a great, accurate gun and have eaten everything thrown at it with zero issues. However, for your application, I would recommend the SR22 for your size.
Let's wait until we actually see concrete legislation before we go off half-cocked. ~ Tom Servo