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Both have a day of preparation. Both are intelligent in technology and have great psionic abilities. Who wins? Setting is Skull Island.

I would say Dr Doom he is smart and resourceful

I think Doom too. His can block out mental attacks can't he? So he won't lose that way. And he is capable of coming up with a plan or weapon in the days prep equally as good as Grodd, if not better. His armour and fields already give him better protection and durability and he has magic on his side. I think he takes the majority.