Cardboard.
Seriously, if you don't want your gun to acquire honest "work-wear," then you need to keep it in the cardboard box it came in.
ALL linings will cause wear. Some faster than others, but in the long run, they're all pretty much the same. But it does depend on how often you work with your carrygun. If very little, then a suede lining will wear the finish the least....(at first)
Personally, I look forward to wearing off the finish of my serious guns by using them!