I'm a LINE-X dealer. Here's just a few comments.
LINE-X is currently the only brand with a written nationwide lifetime warranty.
LINE-X will fade also, but generally not as fast as Rhino. You can prevent LINE-X from fading by:
1. Good-Apply Just Once periodically (
www.justonce.com).
2. Better-Have the dealer apply Nason. It will will remain glossy and will not fade.
3. Best-Have the dealer apply LINE-X Xtra. Xtra is more durable than Nason and is guaranteed not to fade or lose its gloss. It's applied like a topcoat but actually migrates into the bedliner. It's made by Dupont only for LINE-X and no other bedliner brand has a product like Xtra.
LINE-X is harder, Rhino is softer. LINE-X has a tear strength of 304 pli, Rhino's tear strength is 145 pli.
Ameraguard is a decent product, I'd pick it over Rhino, but there are not many Ameraguard dealers around. Ameraguard uses an aliphatic topcoat to prevent fading. The only problem with topcoats is that they can wear down. LINE-X has an older topcoat product called Ultra Shield, but I like Nason or Xtra MUCH better.
Speedliner is a significantly different product. It's a solvent based brushable polyurea paint. It will hold it's color longer but still loses its gloss. It does not have good adhesion properties and dealers must apply an adhesive primer in order for the paint to stick to the bed.
Some LINE-X dealers (including myself) can apply exact non-fading color matches. Here's an example of a color matched LINE-X bedliner:
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