This is in the "that's just your opinion, man" category - but I would choose ethanol free any time I had the chance. Engines run cooler with pure gasoline, so I think you'd probably get longer life out of it.

Phase separation is the biggest problem with ethanol gas. Ethanol absorbs water, which eventually separates out. That process includes the time that the gas is sitting in the underground tank. I've pulled gas out of my tank that was only in there 3 weeks, and have seen the separation layer already formed. Given, that's in humid conditions.

There is absolutely no technical benefit to adding ethanol to gas. I think any engineer will verify that. The ethanol addition is for environmental reasons (mostly debunked), and to keep the corn farmers in Iowa happy.