Solar Cover Straps disintegrating -replacements: Vinyl vs. Polypropylene vs. Polyester vs nylon webbing/strapping?

Hi
My recent replacement solar cover straps deteriorated a LOT faster than some previous replacements (only lasted ~6 months).
I see, in online research, that polyester and Polypropylene are both UV resistant strap materials.
I see online some replacement straps are nylon
I also see some solar cover replacement strapping (Rocky's) comes in vinyl strapping.
I have often used the Fehergard brand, and they lasted longer than the last replacement straps, but they do not specify their strap material.
This seller claims that Fehergard uses nylon...
This sailing retailer claims that Sunbrella brand (which is s'posed to be pretty UV resistant) uses Polypropylene.
They also sell all different kinds of webbing materials, thicknesses, widths...

Has anyone actually done comparisons and know which 3/4" webbing/strap material lasts the longest???
Thanx for any help y'all might provide.
-W
 
I've been wondering whatthe longest lasting strap material would be for my solar cover reel as well. The last set of straps I bought didn't even last 2 years.
 
The straps that came on my Rockys reel outlived the cover and the reel. I'd buy their replacement kit if given the choice.
 
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