The argument goes on. And of course, it's personal choice but based on past experience, I've found that leather, for all day carry, is more comfortable for me when carrying IWB. However, if I'm taking or teaching a course, Kydex seems to work better due to the constant holstering and reholstering. The repetitive reholstering seems to go a lot better. As a cop, off duty, I carried a 1911 in a leather Milt Sparks Versa Max IWB in the 4 o'clock position most of the time. On occasion I would carry OWB, which is arguably, in my opinion, more comfortable, in a leather WM. Davis. I have a Wilson EDC x9 now that I'm in the process of finding a good AIWB holster for, and since it's a pretty new issue gun, don't find a really lot of options. Kydex is selling really well now for several reasons: Price, but also, good leather holsters take several months to get in some circumstances, and some makers just aren't taking any new orders. Have ordered both a Kydex and leather and hopefully they will both serve their purpose based on the particular circumstances. I got a lot of good suggestions when posed the question of which holster to get for it on this forum.