Well i need to use FMP because as far as i know it is the only service that provides access to the 1921 England and Wales census - i think it also includes Scotland but i have had problems trying to look at the original records.
I could not justify the expense of having both FMP and Ancestry subscriptions.
Unfortunately, the GEDCOM upload process does not work with a GEDCOM produced from FMP, which i further fine tune via Family Tree Builder.
Previously it removed sources, so i made certain that i duplicated sources, after this was advised to me, and now i get duplicated sources - there is no happy medium. I still have over 200 profiles to go back to and add sources.