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I've been reviewing both Rhino and Line-X and I'm leaning towards Line-X. Like the lifetime warranty, color match and UV protection. Has a higher temperature failure number than Rhino as well. Just a few things I've discovered in my search. One addition is I have an installer truly 5 minutes from my house.
I have Armaguard in my new F150 and had the same in my last two Superdutys. I abused the crap out of the ones in the SD's and they were pretty much bulletproof.
I've got Line-X in both my '95 F250 and my '13 F150. I originally chose Line-X because the only other option I knew of was Rhinoliner (at the time), and wanted the slightly more rubber-like Line-X over the harder Rhinoliner. The shop that installed the Line-X in my '95 also installed a B&W Turnover ball and were able to do both at the same time so that the top of the hitch is also covered. Because of that, I chose to go with Line-X and the same shop to do the hitch and liner install for my '13 FX4.
Here's a picture of how the B&W Turnover ball looks in my '95.