Arian: 1 God many 'gods' of which the Lord Jesus Christ is first
Unitarian: 1 God rest, including the Lord Jesus, are created beings.
You seem to agree more with PPS: 1 God and the Lord Jesus Christ is an expression of Him but you and PPS, if I read you both correctly, are not Modal and in some ways Trinity, but not today's conception of it.
He and I and probably you, prefer the term "Triune" because we don't believe in 3 gods and are willing to leave some mysteries mysteries. -Lon