Unicron auto-wins. Here's why: He is a multiversal singularity, which means that between all the parrallel unverses, there is only one of him, and he is able to travel freely inbetween universes. He is planet sized. If he doesnt transform, he doesnt have a weak point. If you are somehow able to destroy his body, he will simply inhabit another universe until he finds a suitable vessel. Still took A PIECE OF THEIR GOD'S SPARK to destroy his body in G1, and he still survived that. No known weapon in star wars (besides the twice destroyed death star) can blow up a planet, however we didnt see how the death star would fair against a planet twice the size of alderan and armored with an unknown metal. Unicron literally EATS PLANETS for a hobby. Not to mention the giant mouth in planet mode from which he can FIRE A GIANT LASER. I think unicron needs to be banned from this discussion. He is way too OP.