thing is once you get the peark for heavey armor to make it weigh nothing it basicly makes light armor point less am i right?
You can also get perks to make light armor stronger, so that makes heavy armor useless, right? No.
It doesn't matter which one you choose, there are advantages and disadvantages to both. Most of the disadvantages can be countered with the right perks. However, neither armor is useless. If you are playing a ranger/assassin, why would you wear big clunky steel armor? You would wear light armor.
One main advantage for light armor: Sneaking is easier.