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Ceramic will look better, PPF will protect better.
Most ceramic coatings are rated 2-7 years. DIY coatings are around 2. Like Cquartz UK and gloss coat fit into that category.
Opti-coat being on the higher end as a one time coating with 5-7 year warranty.
You can still scratch, swirl and Marr over a coating. Which means to correct defects, you need to polish them out and reapply a coating again.
PPF will protect from swirls, marring at the cost of a bit of depth and clarity. You get 7-10 years out of PPF before it needs replacing.
For a decklid you probably do not need impact protection of PPF. But if you don't ever want to deal with polishing out scratches or swirls it's a one time application.
You can also apply a ceramic coating over PPF, not that it's required.
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