You know, I really like a mix of the both. PTO scenarios can get stale with the PTO plane set not being as complete as the ETO set atm, however with CVs usually being a factor and frame objectives varying from fighter sweeps, seek and destroy, and more typical land-based targets the action can really vary a lot. ETO seem the opposite, we have richer plane sets but the action is usually the same throughout but in different location on the map (attack - defend).