Shielding tag has torus flow to make you a harder target to get a psychic/energetic lock on, empathic shielding, and aura of fear to ward of would-be attackers and possibly a few other things the Armor doesn’t have. Check the description on Teespring.com.
The Armor I can only speak more subjectively about. There is the official description of course. It seems to embolden the user, bring a sense of security and maybe add a bit of positivity to you and a buffer of positive energy between the user and others. Like adding an extra layer of courage and positivity and security to your aura. These words may be my own personal description of what the concepts of Light and Glory as envisioned by @Captain_Nemo feel like to me.