It all depends on what YOU find to be better suited for yourself.
If you're buying a Sub 2K that accepts only Glock 17 magazines then the choice is made for you. If you buy a Sub 2K that accepts Glock 19 magazines then that means it will also accept mags made for the 17. The hack job that KelTec does on the mag well for the Glock 19 versions look just like somebody did it in their garage with a wood saw. I'm sure you could do the same if you bought a Sub 2K 17 model and decided that you wanted a 19 instead.
The biggest thing I hear is the G19 is easier to conceal then the G17. That is crap I wear the G17 everywhere I go (even running) and no one sees it. My wife is always watching if I imprint because it makes her nervous she can't tell most of the time.
I tried both, and went with the 17 as it fit my big hands perfect. No regrets. I love it. Go hold them both and decide what feels best to you.
I personally have small hands and love my G22. Now On the CCW side of the argument its not that bad unless you bend all the way over. Now The reason I qould recomend a G22 over your current selection of g17/g19 is that it actually can do the job of 3 pistols not just 1. You can get both a 9mm and .357 conversion kit for the .40sw line of glocks and itll use standard Glock magizines for both calibers as well.
Also right now .40sw is everywhere and easy to find plus cheaper than 9mm so you could shoot .40sw till the crazyness dies down then switch to a lone wolf match barrel and shoot 9mm.
It comes down to what feels better in your hand. I have seen guys conceal 5 inch 1911's like its nothing. I have carried full-size, and mid-size Glocks without an issue. I really think how concealable a gun is all comes down to the holster you buy.