How big are the hills you plan to ride?

The principal advantage of a hub with more gears is to offer a wider range of ratios. You need to ensure your lowest, easiest gear is low enough that you can just barely ride up the biggest hill you wish to ride. An IGH with a small range, like a 3 speed, can give you the gear ratio necessary to climb the hills, but might be frustratingly slow on even moderate downhills.