As a glockaholic, I would recommend the 19. I have the 19 and the 26, as well as the 17 in a 9 mm. I also have a 22 and a 23. I have not bothered to get a 27 which is the subcompact 40 s&w.
I love the 19. I have quite a number of 9 mm handguns, from sigs to rugers to glocks s&w, etc. The glock 19 is my fave..., that and my sig 228. They are nice and compact, not too small a mag (the glock 19 is NOT a 10+1, but rather an 15 round mag) and it is just blisteringly accurate. I carry it and my sig 228 because the sig just feels so well balanced in my hand. I am slightly more accurate with the glock, and at 200 dollars less, you can’t go wrong.
I don’t care much for the 26. I have the pinky extension grips and they pinch my hand when I shoot them. They ARE just concealable as everything, but the 19 is almost so.
I use a “thunderwear” holster which fits in front of my crotch and no one ever knows I am carrying. Ever. Google them. They make a great concealed holster. Also Crossdraw makes a nice hip/side concealed holster.
Lotsa glock haters out there, but they are wonderful firearms and so easy to field strip and clean that an idiot could do it.
Only one caveat on glocks. If you load your own ammo and pour your own lead bullets DO NOT USE THE GLOCK BARREL. The twist on it will lead foul and then you will have a KABOOM on your hands. There are lots of good aftermarket barrels for Glock to use if you melt lead and pour your own.
Other than that, I would say you can’t go wrong with a Glock.
Final piece of advice. Borrow one of each and shoot a box or so of ammo thru it. Remember, the gun is only as good as YOU are with the gun. I have yet to hear of a bad guy who mocks the firearm you use to ventilate his chest as he lay dying. Find a gun you are comfortable with, then worry about carrying it concealed.
Hope all that helps.
Glock apparently makes two variations of the G19 in 10+1 (night sight and fixed sight) for those of us who live in states that limit the magazine capacity (i.e., NY, Calif, Mass, CT, etc.)