Most forums I frequent frown upon Vs threads... for the reason that they devolve mostly into shouting wars between the fans.
Like the argument that B5 could take down a Sovereign. TNG fans would point to Picard laughing at laser weapons against the Enterprise in one episode to refute the family of laser cannons from ever affecting any kind of TNG+ vessel.
But then the B5 fans would come back with organic technology in spaceships and having hyperspace, which would be undetectable to Trek devices.
Then there's the issue of First Ones Versus Q.
Who would win? I suppose it depends on which fandom is bigger. Since this is a Star Trek thread, I'd expect the outcome here to be Star Trek. It would be B5 on a B5 forum.