Pocket carry doesn't work with most of my pants, so I almost exclusively use tuckable IWB at strongside hip for deep carry. Yeah, there are random clips that go to nowhere, but that's the tradeoff. I'm looking into modifying the clips on my tuckables into cellphone holsters to try to negate this issue.
With my PF-9, I use a SmartCarry. Completely invisible, and actually pretty comfortable. Downside is that it's basically secured by friction.
For my 1911, I've used the High Noon Holster Split Decision and Tailgate, and a CompTac CTAC.
I liked the CTAC the least. The adjustable clips make it a lot larger and more uncomfortable than the other two, but it is stable. It's well constructed and a good holster, but just didn't work out for me.
I have to recommend against the Split Decision except as a stopgap solution. While High Noon Holster's "glove leather" holsters are workable in no tuck configuration, the tuckable extension is too floppy in this material. This caused it to shift a lot more than I'd like, and it isn't one handed reholsterable. There's also no thumb safety coverage, but this really isn't an issue for Glocks.
The Tailgate is my favored tuckable for my 1911. It's stable, comfortable, one handed reholsterable, and offers good concealment. I really can't find much to complain about, except that the clip can afford to be a little smaller.
For my M&Ps, I use the BladeTech UCH. The belt clip is a lot more discreet than on the High Noon Holsters, but it's not a quick on quick off type. Otherwise, it's comfortable and stable, but concealment suffers compared to the 1911 as they're thicker.