Here are the rules.
The Reapers are invading the Covenant before they first encounter humanity.
The Mass relays are in the Halo Galaxy.
Firepower and shields are equalized proportionally to their mass so two ships of equal mass will be equally powerful.
Please provide proof for your claims.
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The Reapers would win because the covenant would kill themselves because of the halo rings and plus Reapers have done this more than once and the only reason the Reapers lost in the Mass Effect universe because there was the catalyst and also shepherd was God like so...