Get PPF to actually protect the paint work, how much coverage I guess depends on how expensive the car is or how important it is to you to keep it pristine. Mine just has the partial front coverage.
EDIT: PPF is actually a layer of plastic (or whatever it's made from) that's wrapped onto your car so will actually protect it. A ceramic coating is like 1 micron thick.
No idea what booster paint protection is, but ceramic coatings don't really do a lot to protect the paint from scratches or rock chips, though they do offer some protection against more chemical type stuff like bird droppings or tree sap. They're make the car easier to wash and look better when clean. I suppose a ceramic coating may offer some minor protection from scratching but it's not going to make it so you can use a car wash brush or something.
Ceramic coatings are more like a stronger wax vs actual paint protection film.
Interior protection I don't really do anything other than keep it clean with a good quality cleaner (I can't stand the slippery silicone residue left behind by the cheap stuff).
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