My preference of leather over kydex or vice versa is emotional and doesn't really represent any practical considerations.
For whatever reason, the more utilitarian the gun seems, the more I prefer kydex or a hybrid for it. My SIG P250 and P290 and my S&W M&P 40c all have hybrid IWB holsters. I did get a kydex for the M&P but didn't like that particular holster (nothing to do with kydex, the holster was just a ***), and I have a plastic SIG paddle holster for the P290 that came with it that I kind of like and wouldn't mind something similar for the M&P (I don't carry the P250 anymore so I won't be buying any more holsters for it).
For an all metal gun, and certainly for a 1911 or revolver, it needs to be all leather. A hybrid and certainly a kydex holster for a 1911 or revolver just doesn't seem right to me (just like a nice leather holster seems out of place on a Glock IMO). There are exceptions though, a more utilitarian metal gun could go hybrid. My CZ P01 with a Guncote style green finish sits in a Black Arch Holster hybrid, and I might get a Theis hybrid for my 3" Rossi 461. I could maybe see a hybrid for a classic SIG, but definitely not an all kydex holster.
As for style, while I have a few exceptions (a nice Black Hills OWB holster for my .45LC S&W 625MG, the plastic paddle holster for my P290, a few pocket holsters for various guns), the vast majority of my holsters are at least IWB, and mostly tuckable IWB.
For whatever reason, the more utilitarian the gun seems, the more I prefer kydex or a hybrid for it. My SIG P250 and P290 and my S&W M&P 40c all have hybrid IWB holsters. I did get a kydex for the M&P but didn't like that particular holster (nothing to do with kydex, the holster was just a ***), and I have a plastic SIG paddle holster for the P290 that came with it that I kind of like and wouldn't mind something similar for the M&P (I don't carry the P250 anymore so I won't be buying any more holsters for it).
For an all metal gun, and certainly for a 1911 or revolver, it needs to be all leather. A hybrid and certainly a kydex holster for a 1911 or revolver just doesn't seem right to me (just like a nice leather holster seems out of place on a Glock IMO). There are exceptions though, a more utilitarian metal gun could go hybrid. My CZ P01 with a Guncote style green finish sits in a Black Arch Holster hybrid, and I might get a Theis hybrid for my 3" Rossi 461. I could maybe see a hybrid for a classic SIG, but definitely not an all kydex holster.
As for style, while I have a few exceptions (a nice Black Hills OWB holster for my .45LC S&W 625MG, the plastic paddle holster for my P290, a few pocket holsters for various guns), the vast majority of my holsters are at least IWB, and mostly tuckable IWB.