Coldsturm
Pixie in the Playground

...I would guess at low optimization a Cleric wins, bc that's when the chassis matters more, at mid levels I would guess wizard simply because the Wizard spell list is better, and at high it doesnt matter because the universe is being destroyed retroactively as both classes are making new ones, smugly saying "I'll create my own arcane/divine universe with blackjack and hookers.".