I own both. I use the 23 as a nightstand gun and the 19 as a gaming gun. I have a personal preferance for any cal that starts with a .4 or larger. I carry a G30 or a G27. I have all the 9, 40 and 45 models. I like the mids the best for defense.
Here is a thought - I have a Barsto 9mm barrel for the 23 and just change the ejector and the mag and I have a great 19 - it shoots more accurate than the 19 ( I had this before adding the 19 - I got tired of the change over).
Both are great guns - make a choice - you will not go wrong with either.