They don't have to choose, it depends on what species they are working with. If they want to make a wine they have to plant a wine specific specie, if they want grapes for direct consumption it's a whole other specie.

Vinyards are quite an investment, it takes often more than 5 years to produce anything, so you better be sure that you are working with the right plants!

Also usually the vines are clones (for consistent wine taste) and so you can lose a whole vinyard if that specific individual genus is susceptible to a passing disease (since the clones all have the same genus, they are ALL IN DANGER!!!!)

Source: my uncle was a vinyard owner and farmer in the south of france, we talked about all of this while drinking his coop's fabulous wine)