bonafide11
Worker
How soon can this practically be done? Of course late game when I've got cannon armys crushing opponents my gold cities are cranking and I can rush wonders after a few turns of scrimping and production, but we're not talking about that phase of the game. At the early time when one has a choice between expansion and growth, which do people prefer? No way one city is going to produce enough gold before monarchy to support generating armies every turn.
Expansion before growth, in my opinion. There's no reason not to build a lot of cities and then let them grow.