OK, before you buy another gun, get yourself some proper carry gear(0) for your G19(1). MUCH more important than buying another gun.
1. Get yourself a couple quality, stiff gun belts. And quality holster(s). Like yesterday. 1.5" wide is most useful, but a 1.75" wide is good with jeans. Get OWB and IWB holsters. Yes, two or more holsters for the same gun. Next holster after OWB & IWB would be shoulder holster.
2. Both leather and synthetics are good, if you buy quality. I favor leather for carry most times, synthetic if I expect to bathe in sweat.
#1 and #2 above might cure what ails you. A G19 is the usual obese double-stack brick of a gun made by Glock, but even fat Glocks can conceal with the right gear.
Plenty of good holster & belt makers listed above.
If I was forced to give specific suggestions:
https://epsaddlery.com/
OWB Holster:
El Paso Saddlery Tortilla, Strongside Select, or Street Combat. I like thumb snaps on OWB holsters.
IWB Holster:
El Paso Saddlery Border Boss (Or any of the many Milt Sparks VM2 clones)
You'll notice that all of the above are pancake-ish holsters that have two, wide-spaced belt attachments to limit holster+gun thickness.
Belt:
1.5" Dress Belt or 1.75" Garrison Belt with lining option
Mag Carrier:
2F or 2FD Friction Mag Pouch (totes 2 mags). Many mag pouches are overly large, complex, or thick. These are simple, compact, and thin. And work great on both 1.5" and 1.75" wide gun belts.
El Paso Saddlery is not the only good gun leather maker, but they are one-stop-shop and easy to work with with reasonable wait times.
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OK, a G26 is not redundant if you own a G19, but if you are seeking greater conceal-ability, the new, slimmer single-stack Glocks are a better choice...if you shoot them well. I shoot the fat, brick-like Glocks much better than the single-stack, merely "big boned" Glocks(2)
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(0) There is a scurrilous rumor that I bought a complete rig (holster, belt, double mag pouch) a whole two years before I bought the gun that went in them. Just because they were so well-made and pretty...and no longer available as the gal who made them retired.
(1) Which is a fine example of carry tupperware. Not a Glock guy, but they are good quality and the G19 is likely the best of the plastics for most CCW folk.
(2) I shoot 1911-pattern guns better then either.