What is the best fuel shall i use for my 2003 model honda silverwing? Is it 98 or 95 unleaded propane?

Noting that there's a sticker on the fuel flip saying "unleaded fuel only"
also noting that it is fuel injection

Use 98 & stay away from ethanol blends!

Propane (C3H8) is a gas and normal temperature and pressure.
It is unleaded. But if you put it in a tank designed for unleaded petrol, it will evaporate, or worse, explode.

Thank you all for your replies.
but i heard that it varies between vehicles i.e. Some should use 98 and others should use 95, i don't know if this is true, but in case it is, then i need to know what shall i use to my motorcycle.

Propane?

95 is plenty. 98 would be just a waste of money.