I would still take a "9 Hours flight", plus check in time instead of driving that route. The 12/13 hour drive is best case. That drive can turn into 15 to 20 hours or more very quickly.
12/13 hours is not "best case." It is standard time. We make the drive twice a year (summer and winter) and not once has it taken 15-20 hours. Not once. Not even during barrier fires of 2003 when we had to divert via fraser valley.