What are the main differences between Jehovah's Witnesses and Biblical Unitarians?

What are the main differences between the two? I know that both reject the trinity and the divinity of Jesus, but that's about it. I'm particularly interested in knowing their doctrinal differences (if any) with regards to the following points: - Christology, - Pneumatology, - The nature of God, - Soteriology, - The nature of humans (what happens to us when we die), and any other important doctrinal aspects in which they part ways.