Start by reading here.
Carnauba clouds, synthetic magnifies.
Light colored, pick a synthetic - no question.
Dark colored - debatable.
People claim carnauba is better - I see no difference and CEGers at SZ 06 thought synthetic looked better. I use synthetics on all my customers' cars
for obvious reasons.
Unless it's a garage queen, I see no benefits to using a carnauba over a synthetic.
