Having worked on various surfaces / boxes, my impressions were Truck Bed Liner was the toughest out there but hell to write on, HDPE (it was an aftermarket top) was equally tough, but smoother - it was also softer and stained easier, Stainless is the go-to for most, and other than scratches and dings, just works. The wood is pretty, but it seems to get beat up most - depends on what you ask of it, and how gentle you are with it. I actually liked the ribbed floor mat surface as if it got screwed up, it would be cheap and easy to replace, and stuff doesn't roll around on it as easily.
(Reposted due to the server burp)