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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Going with Cabal cuz rockets mcdickface.