High octane is less flammable and therefore needs higher compression to make full and efficient use of it.
Low octane is more flammable and ignites easier.
More octane in a low compression engine will produce less power and run dirtier than a lower octane fuel as the spark will struggle to ignite the mixture.
91 octane is fine in most bikes especially FXR's etc. Run 95 in sportsbikes and don't bother running or paying the difference for 98 its not worth it.
Don't give in to the BP bullshit hype about 98 being cleaner and more powerful, your just adding to their already bloated wallets.
95 is good enough for most, unless its turboed and running 13:1+ comp.

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