I have both a G-19 with Glock 15-rd. magazines and a G-43X with 15-rd. Shield magazines. They both function 100% and both hold 16 rounds. The 43x is noticeably easier to carry than the 19, although the 19 is by no means a problem to wear.
The 19, for me at least, is MUCH easier to shoot accurately in rapid fire drills. I would much rather have the 19 in my hand if trouble rolled around than the 43X. But I like them both.
