What I mean is their is barely no reason to not always use it as your concentration spell.
I dont get the point of using any concentration spell on a tank.
Your task is literally getting hit so your more fragile party members dont get hit.
And Paladin doesnt even get Constituion Save Proficiency, either. So basically one would want to learn TWO feats to make concentration spells on Paladin somewhat viable: Warcaster and Resilient: Constitution.