There is no straight answer to your question. However, let me try."Hence asking someone who's already gone through the process of comparing before and after of many combinations."
Speaking from my experience It is all about room acoustics and placement. If your room is in a golden ratio( Eg : 10 by 16 feet or 12 by 19 or 14 by 22) then you are in luck. The inbuilt Audyssey program of Marantz should take care of the room audio calibration and it would be at least 90% accurate for movies atleast.
For critical music listening a more thorough analysis of room nodes are required.
I have recently used REW and Equalizer APO software (windows 10 HTPC as source device)to fix my room deficiencies to an ok level, further testing required.