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ethanol premium gas or non-ethanol regular gas

Engine

Model: 964 C4, Year:1989, Mileage:85000, Type of use:Street use only
I'm not a fan of having 10% ethanol in my gas but nearly all gas stations have switched over. I do know of a few stations near me that carry non-ethanol gas though (found them on a cool app). It's a higher price, but also only comes in 87 octane. The owner's manual says to use premium gas. So the question is: Is it better to use 93 octane gas that has 10% ethanol in it, or is it better to use 87 octane non-ethanol gas.

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