Different schools of thought on that....

Some say that holsters lined with suede are more likely to cause wear....grit gets caught in the suede eventually and acts like sandpaper. I have a couple holsters lined in kangaroo skin, the theory being that the skin is smooth and non-porous so that it doesn't hold grit and is won't wear the finish.

I had a non-lined duty holster and probably drew my gun several times a night. That did a good job wearing the blue on the end of the barrel pretty fast.

If you have a black or stainless gun, I wouldn't worry about lining one way or the other. It's more important to have a good-fitting holster that holds the gun tight so it doesn't move around in there when you're not even drawing.

I've seen suede lining on some holsters that got a lot of use that became separated or worn away from the body of the holster...That always looks like ****.