[JLMounce]

For a carbureted vehicle, I would prioritize non-ethanol fuel where possible, unless the price is prohibitive.

93 Octane is going to be 93 Octane regardless of the make-up of the fuel, but as already mentioned, ethanol will off-gas and you lose some octane over time. It's not fuel you really want to store a car with. Additionally e10 is much more volatile than pure gasoline. As a result it has less resistance to heat before it boils. This is important with carbureted vehicles to keep the fuel from boiling in the bowls and possibly causing vapor lock.

Your profile states you're in florida, so it does get hot there, but you don't have to deal with altitude that further lowers boiling points of e10 fuel.

If you currently don't have any issues with running the 93 e10 variant. Rubber parts have been upgraded, not fuel boiling issues with the carb, then I'd continue to run that as I'm sure it's 10-20 cents or more cheaper than the pure gasoline mix. If you store your car for periods, fill the tank with the non-ethanol variant for storage.