N>M although M comes first in the alphabetxd
Idk, the decider is Chibaku Tensai really, if Minato has something for that then he could win but I'm not sure if he does, nothing that we've seen except maybe the barrier but I'm not sure if that would work or not.
Whether or not we've seen Minato's abilities to the fullest is debatable, however, I believe we've seen all, or at least most of what he's capable of with the Tobi inscident, seeing as Tobi was perhaps the strongest opponent he's ever faced in his short life and the fact that he fought him while protecting the village from the Kyuubi makes me believe his ass was putting everything he could out there lol.
However, Minato won't go down easy, the fact that he defeated Tobi (even if it was pre Rinningan and everything) and sealed the kyuubi shows his amazing capabilities as a fighter. The fact is, Minato didn't have to die, he chose to for a greater good he believed would result from Naruto learning to become a perfect Jinchuuriki. Had Minato lived, there's no telling how much stronger he could've been after 16 more years. That's besides the point though.
Okay, I'm done rambling U_U