Mythic Fireball is more powerful because?

[Seannoss]

I ask this mostly in comparison to mythic lightning bolt but I believe it is also more powerful than cone of cold and other higher level spells.

[Falcar]

Mythic fireball can deal a lot more damage and negated one of the biggest flaws of the spell being fire resistance or immunity, the mythic power can simply ignore that and burn a fire elemental to death. I admit that the lightning bolts stun is great though.