RE: what is the difference in these two coverings
Printed PVC is like a giant sticker. It is difficult to work with, not very durable and you won't find much to match it for repairs. Oracover is a real, quality heat-shrink film which is sold as "Ultracoat" here in the US. You can buy matching rolls of Ultracoat if you need to make repairs. I'd avoid the PVC covered airplane.