I much prefer the FamilySearch format, as it is considerably more informative than a Memorial number. That being said, I'm a big fan of "more is better", so when I'm trying to be thorough on a profile, I generally line it up like this:
* Family Search Citation
** Find A Grave Citation
Then I'll put a blank line between it and other citations so that it stands out that the two are together. I've not broken down to using the Template yet, as this means having to glean out the Memorial number, drag that back to WikiTree, and add a Template citation that I'm not familiar with at this time, but again - I'm not opposed to it. - Oh, and if I do find a discrepancy, I'll note that in another ** line below the citations, or call it out in the biography.