I found the number one best holster to keep guns looking pristine! But it is made of glass. It's called the dealer's case. Don't buy it and it will never get a scratch.
Bingo!
OP,
Any holster will put wear on the finish. Respectfully, anyone who says one type of material will wear it less than the others is mistaken. That's called perception. The finish will wear about the same rate.......something is holding the gun using friction. Friction wears the black oxide finish. You can't get around that.
Also, just because Brand X wears a finish more than others, and Brand X is made of kydex, does not mean kydex will wear a gun faster. That just means that Brand X wears a gun's finish quickly. I don't even know how people came about the idea that kydex wears a finish quicker than leather to begin with......a quality kydex holster is supremely slick and smooth on the inside.
To the other side conversation going on:
There's a BIG difference between taking care of your gear and trying to keep your gear from showing any use.
Taking care of your gear = conservation.
Trying to eliminate any wear from occurring = preservation.
Two totally different endstates that are achieved through two totally different processes. Just because I treat my gun as a tool, and could care less if it gets worn looking, does not mean I don't take care for my gear or conserve its functionality.
Back to the OP,
Think about what purpose you bought the gun for. Your answer lies there.
A) You bought it to use.
or...
B) You bought it to preserve.
You can't have both.