For most people, the spray in liner works much better than the drop in liners. However, it is my experience that the drop in liner will do a far superior job of protecting your bed and floor from large impacts. We spec a line x in all of our fleet pickups, and for the most part, it holds up pretty well, the exception is large impacts, which I have not only seen puncture the bed floor, but also cause the liner to check and pop off in the area of the impact. Any time this has happened, our Line x dealer has repaired the coating free of charge. A few examples of what I have seen damage Line x include, throwing road construction sign tripods into a bed, them landing foot down and puncturing bed floor, a pallet of 5/8 by 8 inch x4 ft plow blades coming apart when driver hit brakes hard... UGLY ..... and finaly having a 4 ft ditching bucket slide into a wheel well and smooshing it. I have a drop in Penda liner in my personal 2500 dmax, with a rubber bed mat that I put on the liner floor to keep stuff from sliding around, and although not the coolest looking setup, provides me the high impact protection that I need. So far, my penda liner mat combo has laughed at tumbling john deer 450c final drives, dropping flywheels over the side rails, 3ft buckets, Case 85xt skid steer tracks, 800+ pound granite boulders 2 at a time etc. I guess it all depends on how you are going to use your truck that should be the deciding factor. Each liner has its own respective advantages.
