Can second the recommendation for Prestige. About to turn Platinum after completing the Globetrotter as QR Gold through Citi. The 4th night free has saved me many times more than the annual fee too.

Note that any UAE Mastercard World Elite grants the QR Gold, not just Citi.

The other card worth having is the Emirates NBD SPG card. The welcome bonus (if meeting spend) is 70k Starpoints, which is frankly an amazing deal.