Site-wide plots?

Temp group would be easier to manage but the rouge leader has a much more lasting impact especially for whichever group it's in, I love the idea of a rouge leader but something like that it is much harder to run in my experience unless you have someone whose all for it and the nearly unavoidable fallout in a leader position and someone willing to play npc's and tons of communication as otherwise it can descend into chaos or someone may interfere somewhere and prevent something important form happening not knowing what was suppose to happen. Whereas with the temp group it's easy to bypass mishaps because they're an entire blank slate that can be played with however is needed.

But the rouge leader would be the better plot imo, if it can be pulled off successfully.