Who do you think would win? In my opinion, the flood doesn't stand a chance. Flood need the following to spread and adapt: Biological organisms and organic matter. Consume knowledge from the creatures they infect Replicators need: Any kind of inorganic material or mineral. In other words, pretty much anything in the universe can be consumed to replicate. They also have the ability to adapt and spread at a much higher rate than the flood. They can integrate any technology they consume into their collective mind, and if destroyed, they can reassemble in a matter of seconds.