In competition aerobatics its quite helpful to have the same flying characteristics inverted as upright.
For example the Sukhoi SU29 has symmetrical aerofoils with zero incidence and no washout. As a result level flight is 'nose up' both upright and inverted.
This makes cross country flying somewhat less efficient and the forward view not so good. The lack of wash out gives a more aggressive stall (but it flicks nicely).