I appreciate and agree with your opinion. In my Pathfinder, after nine years, the plastic trim looked like I transported dogs for a living. Millions of white hair line scratches on grey trim. I'm trying to avoid this. So to answer your question I would prefer protection on the sides, as they show wear a lot quicker when packing the trunk to the roof.You asked for an opinion... I think they look terrible. I have the Infiniti cargo liner and like it. Under $100, I believe, too. Google it it looks good, I think, and is very durable and easy to clean if needed.
Do you feel you need the side protection? The Infiniti ones don't have that, but the sides are plastic and clean easily, too.