There both big army's with heavily armed people in suits.
And its all of the brother hood including liberty prime.
Vs the same number of cabal with all bosses including Dickface McRocketspam.
And the shield brothers
And every other commander and warrior in the system
Edit, so
Seeming FO4 is out, the bos can use what ever they got there
Cabal have beefed up numbers.
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I'm a mega fallout fan but I have to give this one to the cabal. Think about it. In Fallout 3, The BoS were losing a war with the super mutants. Super mutants are stupid, can't breed, and their weaponry is no more than makeshift. In Fallout New Vegas, the BoS also lost to the NCR, and was forced to retreat. NCR and Super Mutants are no where as advanced as the cabal. Their weapons are better, armor, and they have ships and jetpacks. Let's just be logical.