I've seen the entire 90s anime, read some of the manga (including Codename Sailor V which was
amazing), up through the Black Moon arc, and seen only the first season/Dark Kingdom arc of Crystal.
I definitely prefer the 90s anime and am very attached to it's unique elements- basically, a lot of my favorite things only exist in that version. But I
did enjoy/am still enjoying the Manga, and Crystal is good in it's own way too. I really do want to go back and finish the other arcs of Crystal eventually, after finishing the manga. Crystal is definitely not bad in my book.
That said, I think Crystal's more interesting qualities are mostly where it differs from the manga. The manga has fancier art, but Crystal tries to make sense of some of the more confusing action scenes (seriously, I still can't figure out what was supposed to be happening with the mannequin thing in Act 5 of the manga, with Motoki and Makoto getting maybe sorta brainwashed or what exactly and also Usagi's disguise looked way too much like Motoki which didn't help).
The Shitennou/Senshi thing, as an attempt to expand a plot point that was only evoked in passing by a chapter page opener, is honestly not too bad, and was interesting for a little while. I don't feel like it was
as compelling as the Naru/Nephrite story or the Zoisite/Kunzite story, but I'm open to considering all kinds of wacky alternate ships (maybe it helps that I and my real-life husband practice conscientious polyamory, so I don't get hung up on one-true-pairing monogamy logic), and it had it's moments.
I feel like that arc would've worked better if they had made the season twice as long and spent more time developing how these characters interact. One of my biggest problems with the Manga and Crystal is that it never takes enough time to breathe and goof around to develop what these people are
like, so they feel hollow in comparison. The 90s anime goofed around a little too much at times, but I'd rather wade through unimportant episodes than never slow down for character development.
I can kinda see, and even support, the decision not to have the Sailor Senshi doing the killing- that sort of makes them really creepy in the manga! Not much in the way of redemptions there, just good ol' gruesome, bloody war with few questions asked and fewer still answered. However, I do actually, seriously miss the fact that nobody ever gets their face melted in Crystal, as the manga had some amazing horror qualities to it that Crystal often swept under the rug.
It's also disappointing that they basically ended it the same way via a sudden 'rocks fall everybody dies' kinda moment, and that this prompts the Inner Senshi to get all weepy and sad at once in a scene that feels kind of... I don't know, it's a lot less badass than something like the whole D-Point march in episode 45, where they persevered through hellish circumstances. I'm also mystified by the fact that the Shitennou stones seem to break here- does Mamoru not have them to talk to in the Black Moon Arc of Crystal? If so, that's a travesty; that was one of the most exciting moments in the manga for me.
I also really like the song they made, "
I'm Going Down". It's nice to finally have some kind of image song for the Shitennou, they never did this for most villain groups in the 90s. However, the background/incidental music in Crystal is mostly very dull and has nothing on Arisawa Takanori's beautiful soundtrack.
By the way, what's up with that casually-added little scene of Naru being good at the Sailor V arcade machine (which is canonically a Sailor Senshi training machine), in Crystal?? Were they screwing with our heads on purpose?
Lastly, I love the scene with Umino's bush hands. How did he sneak up on anybody like that??
So basically, I would say the first arc of Crystal certainly builds on the same structure of the Manga, but it veered off in a way that was sort of interesting, and could've perhaps been a
lot more interesting if they did more with it. Alas. It had it's moments, though.