My experience is that Unseen is much stronger than Cult, because they have just so much killing power that they don’t give time to the Blue Dragon to gain enough info, especially if there is also a NK in the game.
I’m not sure about the winning changes of Blue Dragon in games with Unseen and both NKs, but I bet they are extremely low.
On the other hand, a Cult game with no NKs is most of the time a BD win, since BD can just take their time to find out who’s evil. There is no rush.
This is why I feel Blue Dragon should feel no pressure to lynch on the first days, until they have some actual leads. The more you’re lynch-happy, the more quickly your game will end. In an Unseen game, that is almost an auto-win for the evils. And that’s true even if you are lynching some actual evils, as you’re probably just freeing up space for new converts.