Angels are on a different plane to spirit guides who have had past lives on earth. Unlike other spirits an angel can appear in the form of a human or other physical manifestation.
A Guardian Angel is a highly enlightened spirit who helps each of us as an individual. We all have our own, and have atleast two with us since we were born. They help you with your spiritual/soul purpose. They also know anything that has happened to you in this lifetime and also any previous past life times as well. They are divine beings and come from a place of love and harmony and only bring positive guidance to you.