actualy the move should be judged on it's own merits and not how it interacts with the other move.
Moves should be judged purely by which one you think is the "coolest" and not by how it defends/attacks. And the 'power' of the move shouldn't be a factor in juding. When a powermove always wins, it makes it easyer/more tempting for people to fish.
edit: I should of stated that, what I said was mostly IMO... But moves should be judged purely on which one the judge likes best...