If you look at both religions in a doctrinal way then it's obvious that they have many differences (just as all denominations have) and if the agenda is to create clear water to justify why one is superior than the other in this or that then it can be presented as such. The opposite is also true, we can find common themes, ideas and techniques that both share - when Mormon missionaries are proselyting they are trained to build upon 'common beliefs'. In shared experience is understanding forged. I will forever be in debt to the people on this board for opening my eyes to the common experiences, for deconstructing the 'them' and 'us' mentality that religion requires and fosters. When a JW doubts they must confront the same fears and questions that a Mormon (or any religionist) does. All people are afraid to lose family and/or friends,worry they are wrong and have angered the heavens, find it emotionally exhausting to fight against a culture they are embedded in and all have to come to terms with redefining who they are when for so long they allowed others to do that for them.
When I was doubting it was watching others doubt that gave me the courage to reject a god who had taken over my every waking thought. Those of us who made it out the other side are now survivors with joint stories trying our best to help those still caught in the mental and physical nets of religion. It doesnt matter who the slave owner was or what make of leg irons they used - slavery still tastes the same.