Okay, so how would you prove they are an aberrant group?
Most Mormons I have known have a big issue with the Jehovah's Witnesses and are quick to assert that they are a cult. There are lots of JWs who will sincerely assert their testimony. Since the battle of testimonies would be draw, what strategy would you adopt to show the JWs they are wrong.
That is news to me sinse our Article of Faith
11 We claim the privilege of worshiping Almighty God according to the dictates of our own conscience, and allow all men the same privilege, let them worship how, where, or what they may.
Simple!
I KNOW that Joseph Smith was a prophet of GOD and the CHURCH is true!
--MormonDude(Can any JW's say THAT?!)