Minerals before drone or drone before minerals?

In the beginning of the game, is it better to start your first drone first or to send the drones to the mineral line?

I know for terran and protoss you make the worker first so you get 50 minerals right when it finishes, but zerg can make multiple drones at the same time so in my eyes, I see it as being beneficial to send the drones first so the 2nd-7th drones come out faster as opposed to the 1st, 8th, and 9th. Yet all of the pros make the drone first.