Mr Marvel
The Might of the Infinite
Honestly Exodus is truly a beast, However Magneto has like 2 life times worth of experience to master his power. And usually when you're the MASTER of Something it implies that you've reach a certain height of accomplishment suggesting that those who haven't attained said level will be inferior at that ability.
To me it seems pretty obvious that Magneto will eventually win in a battle. Mainly because his nemesis is considered arguably the strongest Psychic on earth, who he has battled for 1/2 a century.
Meaning that he has 1)vast experience fighting Psychics, 2)a natural defense against Psychics (his Helmet, also he helped invent Cerebro)
3) He is a low level psychic, 4) and to my knowledge NOTHING, including a blast from Galactus has breached his shields.
Xavier uses Cerebro to boost his abilities if needed. Magneto used to employ Magnetic devices of his own creation for similar uses, however since being rejuvenated to the prime of his life he no longer requires them. Hell he travels to and from space under his own power.
And if necessary could tap into the Magnetosphere to boost his powers further, He has taken the force of a nuke as well as traded blows with Colossus. He kept Thor from his Hammer which I think truly shows his MASTERY of his natural abilities.