I would drive for the convenience: not having to deal with car rental and getting to the airport, more flexibility on when you leave, and being able to take more stuff with you in the event you need to be without the rest of your belongings for a little while (since you don't mention your belongings, I'm assuming you're hiring movers as well).
But I don't really mind long car trips (so long as I don't have to take any small children with me lol) - if you do then flying might be worth it.