Both sides are your customers, but focus on whichever side is hardest to attract and critical to making transactions happen. Solve a pressing problem for them, and the other side will follow.
I also try to consider who has more patience in the market place. If one side is less patient, often demand side, because once they have the need, they want it now, focus on the other side to start. It is critical to have the right concentration of both supply and demand, but if you can build one population first, without them leaving while waiting for the other side to show up it is far easier than trying to drive both sides at the same time.
Both sides are your customers, but focus on whichever side is hardest to attract and critical to making transactions happen. Solve a pressing problem for them, and the other side will follow.
I also try to consider who has more patience in the market place. If one side is less patient, often demand side, because once they have the need, they want it now, focus on the other side to start. It is critical to have the right concentration of both supply and demand, but if you can build one population first, without them leaving while waiting for the other side to show up it is far easier than trying to drive both sides at the same time.