Similar question as asking which is more important to human's health...food or water. The answer is you need both.
It's hard to consistently score with long methodical drives as penalties, sacks or a big play by the D can derail you if you are shooting for converting on 3rd and 4 constantly. Chunk plays allow quick scores and keep the D honest.
If you cant sustain drives and just rely on explosive plays, your D wears down, their D can scheme to take away the big play, etc.
Give me the ability for my O to do both, as needed...