The main purpose of a 'solar cover' is to keep heat in the pool at night by preventing evaporation, which can cause a significant heat loss overnight. They are meant to be removed during the day since directly sunlight is usually more effective at heating the water then a cover.
The thin 8 mil and less are not worth the money since they don't last.
the 16 mil and thicker are very expensive and don't really last that much longer than the 12 mil to warrant the higher price. They are also harder to handle.
My choice is a 12 mil cover (often called a 5 year cover but if you get 2-3 years out of it you are doing great!) I used to use the silver/blue ones myself because they were generally cheaper in my area but I have stopped using one completely since one of my dogs almost drowned because of it. She thought it was solid and tried to run across it and fell in and was trapped under it. Thank goodness we were outside by the pool when it happened and we were able to jump in and rescue her!
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