If you want to save money, then I would drive.
(1) If you fly you will need to pay for airfare, a rental car or a shuttle. If you drive you just need to pay for gas (and wear and tear on your car).
(2) Since you live 14 hours away, most of your day will be shot by flying anyway. You *might* get into Orlando in the mid-afternoon, but then you have to either rent a car or grab a shuttle. You won't get to your resort until late afternoon or early evening. If you need to change planes that will add even more time to your flight.
(3) Cheap flights usually require you to leave Orlando early. The later flights fill up fast so you are likely to be leaving Orlando at the same time whether you drive or not.
(4) You'll have your own car which is easier to find in the parking lots

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This assumes that you can completely burn that whole first day in travel. If you are in Orlando for less than a week and are buying a UMP, then you will probably want to fly so you can do something that first night. Personally, we never go into the parks our first night even though we have annual passes.
-- Robin