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