I have worked with both a long time...
Uriel is darker or younger in appearance, he/she is protective...the shield...the pentagram of earth
However Michael is more aggressive in protection as he cuts of fire
yellow and blue are neither of their colors really, more raphael and gabriel...of course they appear how the human mind can understand
Roman armor sounds like the god mars, michael is of mercury but is more marsarian, id say mars or an angel of samael or a marsarian spirit is more likely.
angels of geburah...go from there but yes it could have been Michael maybe more in his healer form.