Short answer: It depends.
I can only speak for the fobus and I've had mixed results. I got really blessed (spoiled really) when I purchased my first pistol 5.5 years ago. I bought a used glock 19 from an individual for an awesome price. It came with a fobus holster and a couple of others. I usually keep it in another holster but carried it (up until a year ago) in the fobus. It shows very little wear over all and most of that is on the slide.
I liked the holster a lot an have a tendency toward brand loyalty (maybe a bit ocd); so, I purchased one for a Walther P22. That gun was pretty much brand new when I started using the holster and it pretty much stripped the slide. I don't recall any frame damage, but the slide was in poor enough shape that my brother ended up removing all of the factory coating and duracoating it. To my knowledge, that gun hasn't been put back in that holster.
I've started using a crossbreed for normal carry on my glocks, but still use the fobus if I owb.
On a related note, I have a kydex pocket holster for my g26, and it has polished the edges in under a year. Bottom line, if you're going to carry a gun; it's going to get a little worn.
Hope this helps.