One of the big differences: Mormonism was created in the historical age, there are newspaper accounts[1] of Joseph Smith and his antics. It's harder pill to swallow when your myths are concocted after the Age of Reason, rather than in the swirling mists of "the before time".

But, as others have mentioned, with only one exception, every Mormon I've met has been kind, honest, hard-working (with an emphasis on thrift and education) and polite. Whatever the nutty origins and strictures (no tea or coffee, but Diet Coke is ok?) of their beliefs, I have a lot of respect for the people who come out of the system.

1 https://www.jstor.org/stable/1893428?seq=1#page_scan_tab_con...