I have both. With lots of experience with them both, I've migrated to using the G19 because it has better capacity, quicker follow up shots, and has had better reliability than my G23 (which is generally reliable, but has had some bobbles.) My G19 has been stellar. Superb accuracy. And with 124 gr. +P Gold Dots, terminal ballistics are relatively comparable to .40. I think 9mm and the G19 in particular represent Glock at its very best! For carry, I use the standard mag for 16 rounds capacity with a 17-rnd mag for reload. For home defense I use the G17 mag for 18-round total capacity. Sweet set-up!