Lensmen would win.
There was a GURPS sourcebook during 3rd edition.

The only thing they don't have in that universe is time travel, and the Arisians are able to perfectly forecast the future, so they almost have that. Aside from tossing antimatter planets at each other through dimensional portals by the end of the war, the children of the lens who ended the billions-year-long war between Eddore and the Arisians were basically psionic gods capable of anything. No other universe could compete.