CBB
Funny thing is, I actually helped promote the set that Raiza/Doughboy posted... last generation. I made a C&C topic about it that turned into a Dragonite rework that I never finished! :P But that being said, I can vouche for the set's effectiveness... last generation, before fairy types showed up. The problem with that set now is that every fairy type under the sun walls it, making it a poor wall-breaker in the current meta. Of course, EQ handles some of them alright, but then you have to drop ES or Super-Power and all and all it just isn't as good this generation. And that's a problem because I had to fight to get this set recognized LAST generation, where it was better.
CBB's set on the other hand seems much more tailored to the current metagame. A specially defensive pivot role fits Dragonite very well in this meta, especially since Dragonite is so customizable due to its wide move-pool. Hell, as soon as I saw it I immediately though what a good fit it'd be on one of my past teams that had difficulty switching into Aegislash's Shadow Ball. It just seems like a really good "glue" team member to help you handle stuff that the rest of your team has difficulty with.
As for the other sets, most of them seem pretty lackluster. Hone Claws, as explained, is a poor choice because Dragonite REALLY needs that speed boost for sweeping (80 base speed is really insufficient for sweeping in OU without boosts). Other sets I've seen just look REALLY gimmicky. The toxic stall sets are extremely vulnerable to status, making them really hard to pull off against competent opponents, for example. Others aren't big enough changes to really count as a new set. So really, it's not much of a competition from my point of view.
Disclaimer; I don't think I've even spoken with either Raiza or CBB. My decision is based on merit, not popularity.