On the PC I use Directory Opus as a replacement for Windows Explorer and one of the
very long list of features is a
compare folders facility.
It's well worth buying for the amount of time it saves, ever though it's 'expensive' compared to other Explorer or Finder replacements. Something that took two clicks and 5 minutes took many, many hours to do in Finder, so DOpus saves a fortune in billable time.
I find using a Mac, painfully slow at times due to not having a Mac version of DOpus. Pathfinder is sadly nowhere near as good.