Black kyurem got butchered beyond belief and I can't figure out what to do with it.
White kyurem on the other hand got the better end of the short stick. I could see it being used in rain teams as a way to take down grass arceus as some rain teams struggle with that, and that is something neither palkia or kyogre can do. In sun teams, it does have competition with reshiram for its role but it's ability to take out ground arceus regardless of weather and having higher sa and speed might be worth something. This is all assuming scarf of course
Then there is the ever so dangerous specs set, and roost + 3 attacks set it can use. Having access to recovery sets it apart from palkia as well.
I don't see white kyurem being a reaaaaally big impact in the user metagame, but it sure sounds like it will leave a mark.