What is quickly becoming the most popular Glock, the 43x MOS provides the user a slim, yet full grip paired with an optics ready slide. The Shield Arms 15 round magazines give it the same capacity as the Glock 19, but with les mass.  The rail on the MOS version opens up more options for a powerful light.  Unfortunately, there are not a lot of holster options just yet, but they will come. 

While most shooters would add a modified trigger, I left mine stock. This creates consistency across all my handguns and between my carry guns and my work gun.