I haven't heard much on using blends vs no blend. Here in MI 10% is the norm and hard to find what is known here as ORV gas that has no ethanol.
I think for the most part ethanol has no effect except as TJ mentioned while sitting or storage. Ethanol can settle out of the fuel over time and become more concentrated and thus do more damage. If not running weekly, even to just start and stir the fuel I would recommend a stabilized be added.