World War Hulk vs. Dr. Doom with a twist

World War Hulk gets a Red Lantern ring and Dr. Doom gets a Sinestro Corp. Ring. Both get 1 day of prep learning how to use the ring and nothing else. Who wins?

Doom would win with a Green Ring for sure. He resisted an amped Purple-man's power point blank after he took off his mask.

Still, he may win with a yellow ring, seeing as he's getting prep. Dunno though, it'd be a good fight.

Doom.

Without the ring.