Which oil is better Castrol Syntec or Castrol Edge?

Which oil is better Castrol Syntec or Castrol Edge?
Castrol Egde! Syntec isn't a true synthetic. True synthetics have something called paoi additives. Syntec does not have this. Edge on the other hand is a true synthetic. It has the paoi contents in the oil. Also Edge is the factory fill for exotic auto makers such as Aston Martin, and Bugatti. Syntec on the other hand has no such credentials. Edge also has the 15,000 mile/once a year drain itervals.(which I still don't recommend) Syntec has no drain interval garuntee. So your answer is Castrol Edge. The worlds only advanced synthetic motor oil.