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The only advantage to a paddle holster is that you can remove it without taking off your belt. I have used both styles and I much prefer a belt holster. There are lots of great options available but I usually recommend Blade-Tech products.
I have a Blackhawk paddle holster for my Glock, and its fantastic. It feels alot more secure than previous Fobus holsters I have owned. I prefer paddle holsters because of their simplicity and ease of use. Just tuck the paddle in and go. But then again, I'm no top gun