Usually they specialise on either table grapes or wine grapes. The choice is based on previous know-how, familiar tradition, and local consumption patterns; for example if you’re in Europe you’ll have an easier time selling wine than table grapes, but in China it’s the opposite. Then you got to choose which grapes you’ll plant, how you’re going to prune and “train” them, handling (chilling them for consumption vs. pressing and fermenting them).

I’m not sure but I also think that the local climate plays a bit of a role; more temperate areas will give you more of a choice between planting wine vs. table grapes, while for areas that are too hot or too cold you’ll probably focus only on wine.