What heats better: auto pool cover or solar pool cover?

The autocover has a motor to retract, from what i've read on here the solar cover is the bubble type that can just be hand rolled onto/off the pool.

I was just thinking that if the solar cover heated more effectively, I could retract the autocover in the AM before work and roll out the solar cover to catch the daytime rays and then remove the solar cover in the evening and close the autocover.
 
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