This is a great thread topic you started TonySG!
From what I know, hatha yoga releases emotions mostly from the body (cellular level) but Kundalini also releases emotions from the soul (through the heart chakra).
Hatha yoga taken to a spiritual level can also help the soul, but you won't get this from an ordinary yoga class which is really just gymnastics until and unless your Kundalini is activated beyond merely keeping the body processes functioning.