The higher octane numbers are nice to have. My other consideration is that the higher the octane is the less chance of having ethanol in the fuel mix. The fuel pump has issues with ethanol and ethanol also attracts water. If you're burning it up by the tankful and traveling a lot this is no worry but try to make sure that no ethanol fuel mixture is in the tank for long term storage.
Under other circumstances I would let this slide but more and more governments are using ethanol to 'improve' what comes out of the exhaust pipe. They may have their points lined up but it also causes other issues such as mpg degradation and more instances of water in the fuel.
IMHO
