Thought I'd throw my . 02 in here. I went with the line-x. Here is why -
I found that that the rhino is a little softer, which does prevent things from slipping around in the bed. Problem is that it also gets really soft in the hot summer sun, almost sticky. Also, remember, that the line-x can be applied to achieve different textures - some more abrasive to prevent slipping, and some a bit smoother. Line-x also offers a coating that goes on over the liner itself to prevent fading. A buddy of mine got that. To tell you the truth, I don't think the line-x looks bad when it fades, doesn't get chalky, it just gets dull.
As for durability. I think the hardness of the line-x makes it more durable, less prone to tearing. In the case of the gentleman who had the holes punctured by his camper - With the Rhino, I imagine the plyable characteristic of the this liner allowed it to "Give", while the line-x, being much harder, was punctured. Although I still think the line-x would be more durable for the most part.
Sorry so long,
Craig
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2000, 2500,QC,4x4,white,tow,leather,6 spd,4. 10, 4" exhaust - turbo back, K&N, Balls of steel hitch, line-x bedliner, Autometer Ultralite pyro and boost, Mag Hytec on Dana 80... wouldn't dare add anything to void that good ole DC warranty!