The ring, because you never know what character you will be playing in the far future. All it takes is an expansion or even a patch to bring major changes to kill all the fun of something you might think is your main forever. Or outside events/boredom/change of pace etc. I know diehards from beta/classic who were "warriors for life" or whatever who did 180s years later.
I'm a big fan of BOA, I wish they would go a lot farther and just have one 'super avatar' that keeps all achievements (and more) that can go to different race/class combos depending on what you want to do.
The boots might seem to really help on the contest, but with the cooldown you either have to travel there anyways in advance, or temp set hearth at the inn after using the boots. Depending on zone changes in Cat they could be quite handy, but I rather doubt it...a dalaran 2.0/shatt 3.0 is a given.
Of course, you only need one unique BOA ring so if your luck is amazing choose boots every time after.
(Theres no "contest" in this contest, a few weeks back someone won it by accident the first few mins not even fishing in pools. I won after starting a good 5 minutes late due to an inconvenient phonecall I could not dodge)