The extra size is a benefit when wearing a leather/Kydex holster. I think that in the long run your concept of putting it on and taking it off all the time will seem silly, and the ST isn't
that hard to take off (it isn't fun to put on in a tight spot, admittedly).
Those two Galco models are actually pretty rudimentary holsters, here's what they're lacking:
-not molded for a specific gun, less retention
-single clip on top of weapon increases bulk
-single clip on top of weapon increases wandering
-"J" hook puts weight on pants, not on belt
-one of them will collapse on draw, not only does it hamper re-holstering but your pants stop fitting right when you draw ... fun!
-soft design can allow your belt to force the weapon up ... and out (even worse if you don't have a real gunbelt)
-non-adjustable cant means you get whatever angle you get
-non-adjustable cant means you can't tweak it for the lowest-printing or best-drawing angle
-"J" hook isn't that much less visible than a black clip on a black belt, particularly if you have black pants (and if you
really want less visible clipping, the V-Clip velcro-to-belt clip design is superior)
-single clip means the gun won't be held in as close as paired offset clips will hold it, even with a good belt the gun can rotate more
Now, in the sense of fairness, the downsides of a hybrid leather/Kydex holster with offset clips:
-bulky to store (I use a vertical organizer to hold a few holsters and my mag carrier)
-a bit harder to don/doff
-you get the spot-wear on one side from Kydex edges and general-area-wear on the other from grit embedded in the leather (yes, my guns are wearing more on the leather side)
-you end up taking GFZs less seriously, because your concealment and comfort is just that good
...
I hear about the "drawer of holsters" so often, and my policy of buying a quality all-day wear holster for any gun I might carry means I only have one holster per gun, and generally the guns live in the holsters. If you don't dig the CrossBreed designs, Tucker Gunleather and KHolster make slightly different ones, at a slightly different price point. Any holster maker on the planet is going to have a Glock 19 mold, so you just need to focus on design.
Back when I was looking for MY first holster, I ended up posting pictures of the CB ST when it was new and after break-in in this thread:
http://www.thehighroad.org/showthread.php?t=433559
Here's a testament to the CB ST for you, I bought that holster, wear it all the time, and never bothered to get a pocket holster, the ST is just that comfortable.
I've worn that ST for multi-state drives (>12 hours behind the wheel), all-night events (wearing for >24 hours), carry in areas not friendly to the armed citizen (I'll leave out specifics), and it just keeps taking the abuse.
I treat the gun side with Obenauf's leather preservative for a stiff & waxy finish (BeltMan has the best price on the stuff I've found, it is great for belts and gunleather) and treat the body size with sweat and the occasional light spray of Febreze (it does absorb a bit of funk in the summer)
I do have a few generic holsters, they're universally junk for actual wear. One has become a car holster (I Velcro-ed it to the trunk for stashing when I can't avoid a GFZ) and one has become a range-only holster just so I don't have to set the gun down when I go downrange. Other than that it is all IWB custom-molded holsters.
Spend the extra few bucks, this gadget is going in your pants for
hours and will be holding a valuable device you may need in a hurry. Going cheap is not the long-term solution, it will lead to future purchases and/or not carrying ... or the "photographer's vest of tactical denial" when your concealment is lousy.