I agree with BMatthews. But it also depends on the type of airplane you are working with.

I have several glider type models (rudder-elevator) that came with standard dihedral that always seemed to be less than responsive to rudder. When I cut the wings and put in some polyhedral they became really nice flying models. The turns seemed to be flatter which for a glider was nice.

Years ago I flew in the rudder only class of RC competetion, never won but flew. Those models were of a cabin type fuse with standard (a lot compared to today) dihedral wings. They responded very well to rudder inputs and produced a lot of roll.

The Butterfly fits in the first class of model.