The primary advantage of the striker fired polymer guns that are so prevalent these days is simplicity. No de-cocker, no thumb safety just point and shoot which is why police depts replaced their revolvers with these types. Lots to choose from. I like the M&Ps and have a couple, I've owned Glocks - solid but felt like bricks. I'd look at Walter PPQ's as they are great ergonomic guns, The Springfield XDM's are good but the bore axis is a bit high. Thing to do is visit and handle as many of the 9mm's in the category and see what feels right and points the most naturally in YOUR hand. Some brands have some customization capability by swapping out the back-strap with smaller or larger pieces.