So Kyurem-W is really good. He's pretty much got all the tools he needs to hit everything in Ubers for huge damage, especially since he has the best Draco Meteor in the game and he outspeeds most of the big threats in the tier. I think he may actually replace Kyogre on a lot of teams that already have something to control weather, notably sun teams.
This set in particular is the best:
Kyurem-W @ Choice Specs
Turboblaze
Timid
40 Def/252 SpA/216 Spe
- Draco Meteor
- Dragon Pulse
- Fusion Flare
- Ice Beam
Speed is just enough to outspeed +nature base 90s. You need Def in order to even have a chance to survive Scizor's Bullet Punches and not be 2HKO'd by support Excadrill, and it's more useful than HP and SpD because this is generally played as a revenge killer since it has no real unique resistances (in fact, it only has 3 resistances). With hazards up, there's a very small number of things that it can't OHKO with Draco Meteor (and these things tend to be Blissey, SpD Heatran, etc.). It's just a phenomenal pokemon overall.
Kyurem-B sucks though. He just doesn't have a good movepool. Poor guy. Maybe you could run a Sub/Dragon Tail build?