This is JLU versions of both fighters. They both seem almost like the same person. Neither can fly, both appear to be physicaly stronger than Superman. The only differences are that Darkseid has his omega beams and Doomsday can regenerate and his body evolves slightly after recovering from a disabling injury (like being labotamized). No ringouts, one on one, in the Khazan arena. Who would take it in the end?