No, it's opinion, and I can explain why I feel that way.
IMO they did a good job of the greenhouses in the slab/early fusey years, everything was proportionate and looked like the top/bottom was designed to match each other, whether coupe or 4dr. ~72-78, though, it seemed like they designed everything as a 4-dr, then decided to make coupes and throw a small token window behind the doors. Look at 68-70 Charger vs 71-74 as an example (or a 65-67 Impala vs a 77-78).
75-78 B-body - rear window more vertical, C-pillar doesn't know whether to blend or stand tall. On the 4dr the window is sloped similar to the windshield, and the C-pillar blends rearward into the top of the quarterpanel. 4dr has the nice coke-bottle shape also, 2 dr's arches/shape differ front to rear (probably a design no-no?).
On the Polara/Monaco, the rear window is shorter, and makes the cars look like they've got an oh-so-slightly chopped top from the rear, esp when looking at the size of the windshield, and IMO it throws the whole balance of the car off, and makes the roof look top-heavy to me. The 4dr is much more fluid and proportionate.