There is alot of misinformation on lined holsters. First off, its a manufacturing nightmare.
Its a very diffcult process to get correct. Its unpredictable at times and you lose holsters to the grave yard because of it. And it drives the price of the holster up.
Many makers use suede to line with and thats a problem. Its not a good material and has gotten the reputation it deserves. We use a man made lining for the past 15 years and have had no negative problems. That link below will give you more infomation.
What ever is used to line the holster, I repeat its a manufacturing nightmare. For the customer that should not make a difference, get what you want. As long as you got a professional doing the work you will be OK.
Hope this helps