To be quite honest, I'm not that impressed with the Choice sets so far, Band or Scarf. I haven't even used a Kyurem-B yet, but I've faced plenty, which have all been Band/Scarf, and the main problem I've noticed is that it has a ton of trouble actually coming into the match. Stealth Rock is already a problem for any Choice user, but when you're also weak against Stealth Rock, and taking possible Sandstorm damage, it doesn't make life easy.
I understand that he has a base 170 Outrage, but what good is it when he has so much trouble coming in? It's basically got the same problem that the regular Kyurem had. Haxorus does the Choice Band job better because it's not weak to Stealth Rock, plus he can use Earthquake to hit guys like Levitate Bronzong as well as having stuff like Superpower. Kyurem-B pretty much only has Outrage and Fusion Bolt for coverage until he has to resort to Special Attacks for coverage (meaning that he has to actually invest EVs in it). Salamence is a better Choice Scarf user because it has Moxie and has serious sweeping potential because of that (meaning that he doesn't have to come in as much which makes his SR weakness matter just a little less). Garchomp is also a better Scarfer because he not only resists SR, but has a better secondary STAB. Dragonite is a better Choice Bander IMO because he not only has Multi-scale (if you can keep SR off), but he also has a CB ExtremeSpeed, which has very nice utility for cleaning up as well as preventing fast sweepers from wrecking you. Basically, other dragons are doing the job better with Choice sets.
That's not to say that Kyurem-B is bad though. I'm just saying that the Choice sets aren't as overpowering as people may think they are. I'm thinking of trying out a bulky Dragon Tail user though, since Kyurem-B's Dragon Tail is the strongest phazing move in the game. Something like Sub/Roost/Dragon Tail/Ice Beam could be very deadly with some entry hazard support. I think using his bulk combined with his power is the key, because his Speed just isn't as good as the other dragons. A Mixed set will definitely be pretty deadly too with LO, though it's going to have a lot of problems with SR.