I don't think that you can say one liner is better than the other. What you have to consider is how you use your truck; what your criteria are. Line-X is more fade resistant if that worries you. Line-X is less easily damaged if you do something like haul rock and shovel it out of the bed of your truck. BUT, rhino liner will fix any "chips" lifetime. Rhino has a much more skid-resistant surface.
I buy Rhino because of the skid resistance. When I come to a stop, I don't what to hear my chainsaw, gas can, and tool box skidding forward; hard to retrieve then and possibly could damage the truck or the saw. I'm on my 3rd Rhino liner (meaning 3 different trucks).
2012 F150 FX4 Ecoboost, 2016 Surveyor 274BHS
2003 Yamaha FJR1300, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs