If you want to go all out and have the best protection it would be a clear bra, but that gets expensive.
Coatings are great, but they are not scratch proof, it's more of a sacrificial layer and once it wears down you would have to recorrect and redo. It does not protect from rock chips though.
If it's a DD maybe consider protective film on the hood, bumper, roof, and mirrors and then paint correction/coating on the rest of the car.
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