Board Thread:Questions and Answers/@comment-24684402-20140422152354/@comment-3974711-20140630140235

Explanation aside, on the surface, there's really nothing that sets him apart from regular Big Chill abilities- wise. Their end results are the same.

Big Chill blasts something= enemy is frozen.

Ultimate Big Chill blasts something= enemy is frozen.

Ult. Humongousaur had missiles, Ult. Swampfire could throw bombs and fire a blue laser, etc. Those were markedly different.