Objective reviews and ratings of pool industry products, in the style of Consumers Reports, are often sought but rarely found. It takes a lot of time and money to do that sort of review or comparison, so what you get are people's accounts of what they used and how it worked -- but no comparison.
The closest thing to a comparison would be to read the reviews on reels sold by Amazon. Just be careful to note how many reviews there are: 10 reviews may give a valid impression or comparison; 2 reviews probably will not.
Here's a search results page for solar cover reels sold by Amazon.
I should add that many people seem to find solar covers a total pain, after using them for awhile. This is not a product defect, but rather just the nature of dealing with big floppy sheets of plastic.
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