I do agree that Cole's goal was quite a bit further out, but that is not the only factor to decide which is better. From that kind of distance the only aiming you do is basically in hoping it will go one side of the keeper or the other. Also, Cole hit it straight on, which is by far the easiest volley to perform in football. I would be surprised if most people couldn't set themselves up with a straight volley and hit it with some degree of accuracy.
The skill involved for Maxi Rodriguez to even get the ball into a position he could strike it from was awesome, then there's the fact that he hit it side on, and it went in.
Maybe someone will score a goal that beats both of them hands down, I hope so.