4 vs 5 speed bike!

[anaconda moto]

Here in Ecuador there are selling a lot of 250cc and 230cc bikes ,
some have 4 and some have 5 gears.

Is it true that if a bike has lets say ,20hp and 4 gears that it would be better in the hills than a 5 speed?( 4 speed feels more powerfull)
But a 5 speed better for long distance?

Or am i thinking wrong?
Can someone tell something about it?

Thanks a lot and saludos!