Cold - where you now stand I once stood, the reasoning you use echoes how I thought. It is a terrible waste of an intellect and this is the crime of faith. It makes fools of us all.
Religion is the description of a reality that exists only in the mind. Each imagined reality can be ranked on its regulatory cost, the arbitrary rules one must obey.
JWs impose much stricter intellectual rules than Mormons do which means JWs have less room to think in. A JW meeting is a simple learning by rote from a script process of indoctrination. JWs make some silly claims that science and history do not validate (1914, 6000 year earth etc,) but they don't make many so the cog dis shelf consists of mainly practical situations caused by the rules ( shunning, blood ban etc.) This is the strength and the weakness of the JW religion.
Mormonism is a different take on faith. Intellectually there is more latitude to think and speculate. The day to day rules are currently very positive and endearing. A Mormon meeting is a much more free wheeling affair with members making up their own presentation on a topic. Mormons make multiple silly claims that science and history do not validate ( Israelites in America, healing by Priesthood, ancient books translated etc.) but their day to day rules are generally pro society ( unless you are gay or an independent woman and formerly if you were black) so the cog dis shelf consists mainly of many historical issues (polygamy, Kirtland Bank, racism, Danites, Mountain Meadows etc.) This is the strength and weakness of the Mormon.