I have a few paddle holsters.
Kydex (Blade-Tech)
Plastic (Fobus)
Leather (Kramer).
The Blade-Tech is for my Kimber Compact and works well. Reasonably comfortable, easy-on / easy-off (relatively) and for casual concealment it is adequate.
Bought a Roto-holster Fobus for the Kimber and thought I'd use it for a car holster on 3.5 hour weekly commutes to Detroit and back. It sucked for any purpose except range use.
Have a Fobus (non-Roto) for a Kel-Tec P3AT. It's okay for casual concealment, easy-on / easy-off and comfortable. I use it primarily when out for a walk in the hottest months and I'm wearing shorts without pockets. (P3AT is good for this particular circumstance due to it's light weight.)
Bought a Kramer MSP for my Springfield Armory Mil-Spec (full-size 1911). It sits in my holster drawer. Paddle is hard to put on / take off, it doesn't conceal well at all, I cannot get the holster sized adequately so when I draw, the holster comes up with it (despite the fact that I can't get the dang thing off easily when I'm trying to remove it).
Out of them all, I'd recommend the Blade-Tech. As the holster is connected via Chicago-type screws, it can be adjusted for FBI cant, straight-drop, or cross-draw. You can switch to an OWB belt 'loop' if you want.
I have no experience with the other Kydex makes versions.