I personaly believe that our gatekeeper is a shall we say "Normal" spirit being - at whatever level - who stays around to aid and guide us. The Hierarchy of Angels is another thing entirely - Just my opinion.
Angels are a particularly popular topic at this time.... Do I personaly believe in them - In particular the Hierarchy of Angels - Not sure - never had their existance proved to me yet. Whereas my spirit guides and helpers weather known to me in their lifetime on earth or not show themselves to me on a regular basis.
I do prefer PM - It's there in front of the eyes - My dad used to say "What doesn't speak doesn't lie" and to a large extent I go along with that.