IMO, you can't go wrong with any type of Kramer holster. I have (2) on the belt types, one for an H&K USP and the other for the H&K P7M10 (.40 Cal.)
The most comfortable Kramer I have is a 'pocket' holster for a S&W 422. It's not only comfortable it's handy for those times you have to 'dress-up' or make a quick trip to the store or walk the dog, etc. Just slip the holster and gun into your pocket and your out the door. Of course it makes a great BUG, as well.
I just have never found an IWB or shoulder holster that was all that comfortable for me. I have had both and have worn them. (In that footlocker
)
Of course, in many parts of my LE career, I worn civilian clothes a lot, mostly slacks & shirt and tie with a sport coat, which made it easy for me to wear an on the belt holster.
I'm not a big fan of 'plastic' holsters; however, I just bought a Blackhawk Serpa belt slide/paddle holster for my Glock 27. I tried both ways and decided to use the paddle on the holster. So far, I like the holster and it's retention devices. It is also the best paddle holster I've tried so far. I've been tempted to order a Kramer Paddle holster for it, but so far have resisted the urge. The Blackhawk only cost 35.00.