The next time a JW asks you the questions in the title, just tell them about the "Two by Twos" and the "Cooneyites".
They have some similar beliefs as JWs but are even more zealous in putting kingdom interests first, living far simpler and less materialistic lives than even zealous JWs. They reject the Triniy as unscriptural. They preach in twos. Unlike the JWs they do not idolize an organization. They refuse to draw attention to themselves as a sect by refusing to give themselves a sectarian name as other denominations have. Their only literature is the bible.
The JWs are definitely not as unique as they claim and they aren't even the most zealous self-sacrificing christians out there.