Which is better - 90 octane no ethanol or 93 octane 10% ethanol

Non ethanol is refered to in the industry as "recreational" gas. Started out to be used at marinas, and was very costly. I was told by the Marathon rep that it cost more to add the ethanol, then he told me it cost more to leave it out for the rec fuel. Go figure huh. Any hoo, it is a good product and if it can be had near you, I would run it....