what type of solar pool cover is best?

time to replace the solar pool cover. wondering which type people find most effective. seems like vendors are pitching differenct kinds.

bubbly type? prism? clear? aluminum?

Answers:
I have both the cheap cover and the more expensive aluminized version and to be honest I think they both work about the same.

Other answers:
I have always used the bubble type. It works very well.
I have always used the bubble type. It works very well.
clear
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