Thanks for the replies everyone, since it is basically priced as a brand new gun (even with all the upgrades) I think I'll sit on the decision for a little (and do a couple more rentals between the xdm, m&p and g19) before making a decision that costs a months rent lol
Warm welcome to the Forum.
Just my 0.02:
Glock + Reliable, functional, striker fire, incredible aftermarket support, great customer service, new models with replaceable panels, accurate enough for a duty weapon.
Glock - Poor ergos, lack of beavertail, tendency to slide bite with a high grip, grip angle that strikes some as odd, poor ambi support for lefty's, cheap plastic sights.
M&P + Reliable, functional, striker fire, good aftermarket support, good customer service, replaceable backstraps, steel sights, ambi slide lock, able to field strip without pulling trigger, reversible mag release, lifetime warranty, made in USA, excellent ergos, accurate enough for a duty weapon.
M&P - Gritty trigger that smooths out (eventually), some early models had accuracy issues with either barrell lockup / twist rate / ammo.
I shot both, picked an M&P. Respect Glocks, they just did not work for me.