Unrealistically, Sovereign from Mass Effect.
Because in order to have a "fair" fight against him, they had to destroy his shielding and disable his weaponry. For a "fair" fight. They also had to destroy Sovereignized Saren, which nobody except super-human Shepard could have done.
Edit...
Nimitz-class aircraft carrier [http://www.imagebam.com/image/f61c9527313772/], complete with smaller transformers to create a compliment of fighter jets and assault helicopters.
In addition, thanks to the size, when I transformed back into my robot form I would be freaking massive.
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