Like kelemvor said, the biggest loss is evaporation at around 70%, which is effected by the difference in the water temp. vs. air, humidity and wind. The main thing is to seal off the water with a cover, and either one will do. Manufacturers try to make it look like a fancy one will be a huge benefit. I've bought the most expensive and moderately priced ones, and I didn't notice a difference. Right now I have a clear one and am very happy with it. The most expensive one also fell apart the quickest, and it was supposed to be a "7 year" cover. Posts on the forum indicate that 2 to 4 years is about the norm for any cover.
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