Soldato
Apple threw in a load of fixes for Office 2016 in with the Capitan 10.11.1 update and that seemed to sort a lot of our issues here; it's not perfect (few odd quirks with Word) but it's definitely usable now.
But if you're still having problems with 2016 then it's worth looking at going back to 2011 as Microsoft were relatively quick to sort out any problems with the last Office update and from what i can tell, it's pretty stable.
But if you're still having problems with 2016 then it's worth looking at going back to 2011 as Microsoft were relatively quick to sort out any problems with the last Office update and from what i can tell, it's pretty stable.