Both have almost the same damage and healing potential in battlegrounds, AC slightly higher damage for less effort
Arenas will likely depend on the comp the pally is running. Rated Solo Shuffle seemed to be mostly team AC, but regular 3s is probably comp dependant. We’ll see next week what people end up doing if there are any paladins left not running turbo/that havent rerolled rdruid or presevoker
BGs i’d honestly say go by preference. As long as you have aura of reckoning, both wings are viable, just one will aoe heal for you passively through crusader strike/judgment and the other requires manually healing. If you run caster wings i’d recommend going into veneration, since every flash of light crit gives a hammer of wrath reset which is great for mana management in prolonged teamfight when you can’t dip out to drink without your team wiping. Veneration has significantly less value with melee wings