I have a nice IWB, a hybrid Tucker Answer for the Glock 27, but never found it comfortable to carry. Now that I've lost the big belly, I might try it again. For the G27, I use a Bianchi OWB with a snap retention strap. Very secure when climbing through the woods.

Nowadays, I love the leather DeSantis OWB with the Kimber Micro Nine. It retains well even running through the forest. So, I use OWB ~95%, and a Smart Carry at 12 o'clock for deep cover in warmer weather. With both of these it's easy to forget I'm carrying.