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Enchantment and Conjuration are probably still the strongest overall.
Evocation gets the biggest "buff" in Mythic games; not only are the mythic versions of the spells much better, abilities such as Channel Power can circumvent SR and other defenses. But Channel Power can be used with spells of any school.
Transmutation and Illusion seem to be the least improved. Both of them become amazing vs. non-mythic creatures, but aren't actually that great vs. mythic creatures.
That's in general, personal opinion terms. For specific builds, a certain spell from a certain school may of course be overwhelming.

Mysterious Stranger |

I would not discount illusion that quickly. Tangible Illusion can turn an illusionary object into a real one for 10 minutes per tier. Mythic spell focus and the increase of the casting stat can boost the saving throws of spells to the point where only a natural 20 succeeds. All those save or die spells become a lot more potent in a mythic game.
I do agree that evocation gets the biggest boost. Not only are the mythic versions of the evocation spells powerful, but there are also a lot of Archmage path abilities that work best on evocations spells. Spell Dilation increases the area of your spells so you can affect more creatures with your area of effect spells. Elemental Bond increases your caster level for spells tied to your element, Energy Conversion allows you to change the type of damage you do with your spells. Arcane Metamastery allows you to add metamagic feats to all spells you cast for the next 10 rounds. Channel power as mentioned can increase the damage by 50%. Eldritch Insight makes the DC of the spell based on the spell slot used, which works great with Arcane Metamagic.