hello a Major difference - Jehovah's Witnesses have many Gods.
JWs pride themselves to be teachers of God's word going to peoples' doors mainly in sincerity to teach people what they think is the truth.
JWs believe the father is the only one called God and since the Bible says God is one the father must be the only one person who is God.
However when we go to Jn.1 we find there are two called God. Lets count who is called God. This is so simple.
John1:1-3 "In the beginning was the Word, and the Word was with God, and the Word was "a"God. v.2 He was in the beginning with God. v.3 All things were made through Him, and without Him nothing was made that was made."
blessedstar