Gaz 100LL

If your aircraft has been using the auto fuel and you're not flying at high altitudes then the auto fuel is much cleaner for the engine over its life span and will require less maintenance ovrr the long haul. No lead build up. Almost everyone i know runs auto fuel and of course there are some exceptions. 

If you do run ANY 100ll then use something like Decalin. It's a lead scavenger and will help with lead reduction, but it isn't a cure all for leading.

If you like doing the extra maintenance then use the 100LL. The engine prefers UL and is fine with 10% ethanol as Rotax has stated.

Note: Rotax accepts 10%  Ethanol FOR ITS ENGINE ONLY.

This does not include the aircraft's fuel reticulation system.

You will need to check with the aircraft manufacturer, to find out if they accept 10% Ethanol blend. being used in the aircraft😈

The engine is good to go. There are areas in the world that use higher ethanol content. The hoses are good otherwise we'd all be sitting on the side of the highway with leaking hoses in our cars. So it comes down to the fuel tank. Most are okay with it, but an epoxy tank that is not coated inside may not be okay and cause issues. If you're not sure just call the aircraft MFG and ask about the tank and ethanol.