I haven’t taken my G17 out of the house since the day I got my G43X and I don’t see the G19 being any different as I have owned a total of three of them. In terms of value, I would say that you’re pretty much even. The G43X is definitely the more useful of the two in my opinion. It is lighter and thinner, has a shorter slide/barrel in case you happen to carry AIWB, it matches the G19 for capacity when using the Shield mags, and it offers the same grip length.
I am personally comfortable with the factory 10 round capacity on the G43X, but if you are interested in the Shield mags, they do take a while to get these days so this would be a good way to get them in hand without waiting on a back order status. Also, the G43X already comes with night sights installed, and if you are lucky... a bunch of them were sold with Ameriglo Bolds which is what I have on mine.
In my eyes, the G43X and the G48 have rendered the G19 obsolete unless you are a uniformed cop wanting a slightly smaller than full size duty weapon for carrying on a duty belt. If you are a concealed carrier/citizen looking for a solid HD pistol that doubles as a carry piece, the G43X is a winner.