I think that driving for bigger guys is more important than handling.
One of my centers has strong handling and he has the same rate of turnovers as a inept handler but they have the same passing, which leads me to think that passing is more important if you don't want to have turnovers than handling.
On the other hand driving helps when shooting and is a lot less wage sensitive than IS, so training driving makes sense later on.
Also, driving pops a lot when training SF/PF so it is easy to pop it up.