The only thing that R beats the manga/Crystal version in is the villains (well, except for Rubeus, Black Lady and Death Phantom/Wiseman). In everything else, The Black Moon arc is superior. There's no stupid break-up arc, Chibi-Usa is a well-developed and nuanced character who's reasons for turning evil are actually sympathetic, Pluto is actually involved and is developed as a character in her own right, the finale is better/more epic and emotional, how Chibi-Usa turns back is better, there's actual lore on Death Phantom/Nemesis and how Crystal Tokyo formed, Usagi gets substansial character development herself, basically everything is better!
The villains are quite weak though in comparison to R except for a select few, so if that's a deal-breaker for you R might be better. But if you're the type who only cares about the main cast and the plot, then Manga/Crystal Black Moon definitely beats out R.