Regarding the conceal-ability issue, I found that the G19 and G17 have been equally difficult to conceal, IWB and OWB. I have to drop all the way down to a “baby” Glock, to achieve noticeably better conceal-ability. We all have differing body dimensions.
Notably, frame width does not seem to affect concealment, on my body. The P229 is a CHUNKY pistol, but, it does have rounded corners, especially the “SAS” version. I found the P229 to conceal better, on my body, than a G19 or G17. When I transitioned duty pistols, from the P229 to the G17, I maintained my habit of tending to carry a duty-sized pistol during personal time, so, had to start wearing fuller-cut outer/cover garments.
IWB, forward of the hip bones, a.k.a. AIWB, is where the G19’s slightly shorter grip makes a difference in conceal-ability, compared to the G17, BUT, really, both the G19 and G17 are too blocky/bricky/boxy to work for me, inside my trousers. Neither is comfortable, and neither is concealable enough to fool anybody. I have to drop all the way down to a “baby” Glock, for AIWB conceal-ability, and, even then, only with the Phlster Enigma holster, for comfort over an extended time. (Really, revolvers are my best option, for AIWB.)
Notably, there was one niche, in which I found a G19 worked better than a G17, and, concealment had nothing to do with it. In the tight confines of the Ford Explorer-based “Police Interceptor,” I found that the right seat bolster tended to “intercept” the grip of a G17, when I had to bail-out of the front seat passenger door quickly. When I had to start driving a Ford, instead of my MUCH-preferred Chevy Tahoe, I learned to carry a G19, in the duty holster, when I had a partner who was driving. That fraction of an inch of grip length made an amazing difference. When driving, or paired-up with a partner who was driving a Tahoe, or using one of the Crown Vics still in service, I carried the G17. This only affected the tail end of my career, thankfully.