Use logic, feats, and stats.
Assume firepower and shields are equalized.
The First Order has StarKiller.
The Covenant have High Charity.
The galaxy's are merged. Covenant on one side, First Oder at the other.
Both at their peaks.
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You come to [i]my home?[/i] You bring your [i]armies[/i], and your [i]warships[/i], and you threaten my people? Well I have one question for you; [spoiler]How can the first order win if the stormtroopers can't shoot a damn thing?[/spoiler]