I've purchased a lot of holsters for my 26.
Blackhawk nylon size 5: Works for when I'm wearing sweats, or anything without a belt.
Galco Summer Comfort: Anything but comfortable. It's thick, and it just adds to the already-thick Glock.
Raven Concealment: Great OWB. Works for concealment OWB. IWB? Don't bother. It's kydex, so it doesn't flex. I carry at 3 o'clock, so it's not very comfortable.
Comp Tac MTAC: Got one of these because I already have one that works very well for my HK P2000. I'm still breaking it in, trying to find the cant and depth that is most comfortable.