User blog comment:So-Pro Warrior/Special Sneak Preview of Season 2: Battle of the Ultimate Galaxy Savers: Master Chief vs. Commander Shepard/@comment-5465602-20130613033157/@comment-4248317-20130613053356

Master Chief has led UNSC Marines and fellow Spartans against the Insurrection, the Covenant, and the Flood. Based on that, as well as other information about his life, I would put Chief's intelligence at equal, if not higher, than Shepard's.

Also, Kai Leng isn't as fast or strong as the Chief (and Shepard needed help beating Kai Leng, whereas Chief usually fights alone).

Not trying to bash you or change your vote, just pointing those things out.