Board Thread:General Discussion/@comment-99.226.13.217-20151113214806/@comment-6881629-20151113220258

Morokei's mask is light armor and gives a big boost to magicka regen, Nahkriin's mask is heavy and gives a boost to the amount of magicka you have and reduces the cost of destruction spells. If you use destruction maybe Nahkriin?

If you use the mage armor perk though they will both stop it from working.