Springfield XD Mod 2 9MM. LAG tactical holster. Best, most comfortable, most custom fit, highest quality holster I’ve ever found. IWB or OWB. Gun physically snaps in. I can shake my holster upside down and gun doesn’t come out. I actually have to pull it out, which I love. They custom mold the curve of the holster per your waist size and which carry position you select. And you can pick any combination of front plate and rear plate colors. You can even choose different thicknesses for the kydex. The outer plate is curved out at the top so you don’t have to point the gun into your body to get it into the holster, and the back side fully covers the slide, so there is no metal contacting your body and no sweat getting onto the slide.
I haven’t been able to find a better holster, at least rigid kydex.
If you want something soft, I’d go with Stealth Gear USA. Expensive, but probably the most amazing soft holster available.