I carry a 26 OWB and it conceals great under a shirt tail in the Glock holster. I've never carried the 19 but I can't imagine the longer grip conceals as well. I'd just have to try it and see. But I am certain that with a grip extension on your spare mag, the 26 become more veratile, which might make it the better option since it's doing double duty as a nightstand gun. Also, what gen 19 have you shot in he past? A gen 2 grip is different, so you may not shoot it as well if you've been shooting a 3 or 4. Just my initial thoughts.
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