preferential
adjective [ before noun ]
uk/ˌprefərˈenʃəl/ usbetter than that which is given to others:
It is not acceptable, in a modern company, to give preferential treatment to your relatives and friends.
Bananas from Caribbean countries have traditionally enjoyed preferential access to the EU.
preferential rates/terms/arrangements Members can get preferential terms on services such as free mortgage valuations and discounts on personal loans.