Regardless of the winner these two are some of the most awesome villains in fiction and have some of the most charismatic personas ever, not just because of their speeches but because of their ideals... dangerous ideals! One wishes for humanity's ascension through the spreading of a mutagen that will only empower those strong enough to withstand it and the other wishes for a anarchic society where personal might make right!
You forgot abour doomslayers lore accurate strenght, he beat a guy who can make universes just by existing whos basically a god of everything and won with his weapons only (not even using crucible) and he lore accurately is immortal meaning he could actually survive any attack darksied uses and even kill him without needing the crucible. The crucible would one shot darkseid