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The (supposed) first sentient race in each universe go at each other.

Round 1:

Builders (all shown Creators and Engineers)
vs.
Guardians (original Guardians killed by Sinestrollax)

Round 2:

Team Builders (Those shown on panel only):
Creators
Engineers
Alephs
Gardeners
Abyss
& their Fleet

vs.

Guardians (same as round 1)
Hal Jordan
WL Kyle
Atrocitus
Bleeze
Larfleeze
Sinestro
Arkillo
Saint Walker
Brother Warth
Indigo-1
Munk

If Team Builders wins, Team Guardians gains the new Guardians that showed up after Sinestrollax killed the originals.

If Team Guardians wins, Team Guardians loses Larfleeeze

Someone has to be willing to take a shot at this

I'll go with the Guardians and the Lanterns.