To me, Mog wins. 4x effective PC HP > Power Charge'd God's Hand, even Tarukaja'd, and it's possible that Mog could get into a HP range where Chie can't use that combo twice in the battle. He also should have some evade, which tilts the match a bit further in his favor. It's not a very close match if you allow the Snow Muffler, is definitely a lot closer if you don't (I think Chie may win that, even).