For OWB my personal opinion is that some kind of retention is required.

That, plus being a Safariland fanboi leads me to the 7378 and similar holsters.

Many of the 7378 holsters come with both belt loops and paddle, so you can swing both ways.

Because I have a thumb position honed by years of putting my thumb over a 1911 safety, pressing the lever back to release the handgun from the holster actually comes at zero cost - it's just what my thumb does as I come down on the grip.

...and their price is quite reasonable. Though buying one off-the-shelf is nearly impossible, so I typically turn to Optics Planet for Safariland holsters.

O2