Originally Posted by Fat Hugin
You're trading 10 points of SA for 10 points of defense and swapping Pressure for Teravolt. Not to mention the ability to go mixed, throwing uninvested physical hits like a max-atk Mence. Now, Pressure might be better for a staller(though uninvested DTail has it's appeal), but on a sweeper, Teravolt is well worth 10 points of SAtk.
That's why I said: Pure
special attacking sets. Mixed or pure physical sets are obviously better done by Kyurem-B. Also, 10 extra points on Defense hardly make an difference, and Teravolt is really only useful for hitting Bronzong and Rotom-W with Earth Power; as Lati@s and Hydreigon are weak to Ice Beam anyway, and Gengar is too frail to survive an Ice Beam.
Though really, Kyurem is too hard to justify over Kyurem-B if you aren't using a more stalling-oriented set.