Unicron vs The Death Star
Unicron is floating around in a galaxy far, far away and happens to stumble upon the Death Star. Unicron goes "Giggity!" and prepares for nom nom mode.
The Empire is aware of the impending attack and launches every single TIE fighter, Star Destroyer, and all other ships in the entire fleet against the giant robot. The main laser is online and functional.
1) Unicron from Transformers: The Movie (animated)
2) Unicrom from all comic book, manga, and related cartoons shows of the Transformers franchise.
Unicron can transform from planet mode to humanoid mode.
Who wins?