+6 or 7 on the Comp-Tac MTAC. I switched to it late last year for my 1911, and never looked back. As HV mentioned, it's highly adjustable to meet individual preferences about height of carry and cant. The leather backing is generous, wide and long. And the combination of leather and Kydex makes for a holster that always has a consistent amount of tension, offers a rapid, repeatable drawstroke, and a holster mouth that never collapses so reholstering is never a problem (and doesn't require extra layers of leather to accomplish this; the extra layers at the mouth makes other, all-leather holsters thicker). It also needs no break-in to be comfortable and reliable on day one.
I also own some all-leather holsters that are extremely comfortable, like Milt Sparks and D.M. Bullard. And I'm keepin' 'em.
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But the MTAC is inexpensive, and once I tried the leather/Kydex combination for IWB, that's what I'm using. I went to all-Kydex a couple of years ago for OWB, so I guess this is a natural progression for me.
But a carry holster is a personal thing. What I like, you might not. So don't take anybody's word on what is the best holster for you. Something as basic as the angle of cant will offer a very different feel for someone who carries at three o'clock compared to a 4:30 carry. So don't get too upset if you end up buying two or three holsters before you end up with one you really like.
As others have noted: the biggest mistake is thinking you'll carry your new gun reliably, effectively, comfortably, and for many hours at a time in a cheap holster on a cheap belt. The carry system is made up of all three components, and you don't want anything of unacceptable quality in the mix.