Covenant vs Fallen? Covenant wins easily. Were talking a [i]empire[/i] vs a few fallen houses. No contest. Now if it was covenant empire vs cabal... Hive vs Flood? I'd go with hive, only because they have Oryx. If he could "take" the gravemind, its all over for the flood. Vex vs Prometheans? Idk. I feel that in a straight fight, the Prometheans would stomp. But the Vex could just go through time and dick around. Who knows about that one. Cabal vs Brutes? Seriously? This is as bad a covenant vs fallen. You have the shattered brute factions uniting against the Cabal [i]empire[/i]! The Cabal take this one easy in my opinion.