It's like trying to choose between two flavors of pure aesthetic perfection. Since, technically, you can't have more than one thing being "perfect", this introduces an error into the equation. This also implies that one is "less" perfect than the other, which is impossible. This can be circumvented by simply accepting that anything involving Hayden Christensen automatically equals pure perfection; just like you have to accept the unit of "one" being singular, in order for 1 + 1 to = 2.
The decision of which picture to choose can then just be based on something random.

I like flipping coins.