User blog comment:ImperiexSeed/Strongest named angels scale, from greatest to least!/@comment-4011543-20120107133756

In the timeline where Michael gains Dean as his vessel: Well, it would be: Michael < Lucifer < Raphael < Gabriel < Zachariah < Virgil < Anna < Uriel < Castiel < Balthazar < Joshua

As for the timeline shown on the show, where Michael gains Adam as his alternate vessel, and Lucifer has his true vessel (Sam) in place and therefore could easily kill Michael, it would be: Lucifer < Raphael < Michael < Gabriel < Zachariah < Virgil < Anna < Uriel < Castiel < Balthazar < Joshua