EE2 is actually very, very much balanced. extremely balanced.
but ic2 isn't balanced.
Think of it this way, one mod allows you to sit still for hours on end in your basement, feeding a machine with a lot of other machines while machines do all the work for you, producing a magical substance that can be used to make pretty much anything in Minecraft, the other is Industrialcraft.
Industrialcraft is extremely balanced because not only is it fine to be combined with other mods, it is practically meant to be played that way.
EE is not (in my opinion) by any extension of the word meant to be combined with other mods, therefore which one is the less balanced of the two? While EE is, in your opinion and to some extent mine, balanced within itself, Industrialcraft manages balance with both itself and other mods as well leading me to believe that EE is the less balanced of the two.