Is there a comparision between different Valor builds?

Was just wondering with same gear (level), how much better could be the Shotgun build related to the Ivory Tower (Lazy Shotgun) or Darklight (Blessed ground) builds.

Tried all 3, have up and downside for all to me.

You have some experience or feeling for it?
For example with Darklight can do GR100, Ivory Tower 110 and Shotgun 120 with certain item perfection and paragon level?