I started using the spray in bed liners years ago. The first one was from Ziebart (Rhino) and I liked it the best. It was a rubber type that did not chip and lasted the 15 years I owned the truck without issues. It also stopped things from sliding around in the bed. The second one that I have in my current truck is alright, but not as good as the first. It is slick and allows things to slide. I have also noticed a few places such as bolts where it has chip off. It’s not a huge problem because it a F250 with an aluminum bed. So it won’t rust, it just bugs me.
I’ve also had caps, soft tonneaus and the tri-fold hard tonneaus. The tri-fold has been the best. Easy access to the bed or just a portion of the bed. Easy to take off if I need to haul my Can-Am 4x4.
Trucks normally come with tie down points in the bed. My Ford has additional places to add tie down points and they have come in very handy. They are a good addition to a truck.
Hope this helps.