Paladin makes our heals heal better and have some mitigation in the form of 12.5% elemental damage reduction. That’s about all paladin1 gives, subtle effects that make pve damage mitigation better.
There are other fantastic choices like Cleric2, Priest1 or Oracle1 for your case too. Personally I would take Cleric2, it gives so much additional usefulness over priest1/paladin1/orcale1 in your build. Paladin1 works better the more heal tiles you are able to put out, in your cleric1 build I don’t think it is really good to go for paladin1 as a R6 choice.
It gives fade, stronger safety wall and divine might.