People who switch between Glocks and "non-Glocks": How much do you notice a shift in aim speed and POI?

So I've only shot a Glock once in my life: 5 years ago when I took my first CCW course in a previous state using the instructor's G19. It was only one shot but was a bulls eye at 7 yards.I ended up getting a LCP as my first gun and then eventually a Shield a few years ago. I shoot the LCP great (IMO) and the Shield 'decent' (I find the heavy break very jarring personally).I'd like to pick up something for winter carry (something that can fit a gloved finger) and am torn between a M&P9C and G19. Honestly, I've had a few problems with my Shield that is pushing me towards the more expensive G19 (including the recommended upgrades to the trigger).So my question is: How big of a difference in aim speed and POI do you see going back and forth between these two?Thanks! via /r/CCW http://ift.tt/2h6Daq5