Re: Beauxbâtons - Written in French.
It seems the Salem drama stems from some of their players, and the Hogwarts drama from the eccentricities of their coach. For that reason, amongst others, I would say Hogwarts is the greater danger.
Of course, the disadvantage these teams have had is that their drama has been played out mostly in public and therefore gossiped about, which makes them appear weaker. Who knows what goes on within Durmstrang, but they do tend to keep things within their team.