Board Thread:General Discussion/@comment-24269730-20140302225653/@comment-7763430-20140408145223

Upgrade has more potential, but Jury Rigg can do more permanant adjustments (though I imagine Gray Matter is more effective). Upgrade is limited to the Time Out feature of the omnitrix. I always liked the possibility that Upgrade could possess the Omnitrix and change it if he so chose, though.