From a speed standpoint, you can't beat the plastic holsters. I lean towards the Blade-Tech brand when I go plastic. There are cheaper lines out there, but an $800 gun deserves a quality holster.
All that said, I like leather or horse hide best. In an OWB your belt will better pull the gun into your side and conform to you. That makes it easier to conceal the gun. Draw speed will be a tad slower, but the concealability is greater.
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