The derby winner will receive a substantial chunk of experience (or money at maximum level) and gain 5000 reputation with the Kalu'ak. In addition, the champion will be given a choice between two unique rewards:
Dread Pirate Ring
Binds on Account
Unique-Equipped
Finger
+34 Stamina
Requires level 1 to 80 (80)
Equip: Improves critical strike rating by 53.
Equip: Improves hit rating by 29.
Equip: Experience gained from killing monsters and completing quests increased by 5%.
Boots of the Bay
Binds When Picked Up
Feet
Requires Fishing (200)
Equip: Increased Fishing +15.
Use: Whisks you away to the finest drinking establishment in Booty Bay. (1 Day Cooldown)
who wouldn't choose the ring?!
Well, if you are already max level....Boots to take you to a great drinking establishment??? Winnar. Can you win more than once though?
Perfect! Use those boots to send me to my doom!
My decision would depend on how "(1 to 80)" heirlooms will work in Cat. We know they're not scaling, but there's no word on if the EXP modifier is staying intact or not.