Here's one thing to consider. The Seecamps and NAAs have heel style mag releases, the Atagua/MPA style have a button that pulls to release, and the Kel Tecs and Berettas have push buttons. The heel releases are hard to accidently activate (some would say hard to intentionally activate) so they work fine in the pocket on either side. Same with the MPA style. The push button can be a problem. If you're right handed and carry a Kel Tec in your left side back pocket (as a backup to your weak hand side or as a left handed primary) the button is on the outside. If you sit on a hard chair or something and the holster doesn't cover the button, the mag can pop out. Carried in the right side pocket, the button is against your relatively softer butt and it's much harder to release. Something to consider when picking a holster.