Homoiousianism which maintained that the Son was "like in substance" but not necessarily to be identified with the essence of the Father.
Homoianism which declared that the Son was similar to God the father, without reference to substance or essence. Some supporters of Homoian formulae also supported one of the other descriptions. Other Homoians declared that God the father was so incomparable and ineffably transcendent that even the ideas of likeness, similarity or identity in substance or essence with the subordinate Son and the Holy Spirit were heretical and not justified by the Gospels. They held that the Father was like the Son in some sense but that even to speak of ousia was impertinent speculation.
Heterousianism (including anomoeanism) which held that God the father and the son were unlike in substance and/or attributes.
As a whole christians don't all agree there are more theories