Gotta say this was one of the best of Season 1 Crystal when it looked more 'shounen'.
Yoshi!
You are WORSHIPPING Cystal?!!?
Even though I'm not a particular fan of this art style, I have to admit it's a very good animation piece and one of the most dynamic action scenes of the whole Crystermos adaptation.
The art style, itself, reminds me of the new 90s anime art during the debut of the revival that came with goodies such as calendars and with the exclusive box art of the DVD sets.
It looks a lot like Kagawa's Precure style and it wouldn't surprise me that it was him who did those box art visuals (even though that Walmart Disney Princess shading style should be Burning Mandala'd into oblivion.)
I had never noticed it on Dragon Ball before and now I can't unsee it. I admit I'm not a great fan of Dragon Ball but I'm still surprised I'd never noticed it before, the differences can be as drastic as the ones we observe on Sailor Moon. Now that I look it up, the difference between animation styles on Digimon Adventure, for example, seems to be much more subtle. Maybe that's when they started to go digital?
Katsuyoshi Nakatsuru - a major animator in DBZ who would become the character design in DBGT was also the character designer in a lot of Digimon series.
Yukio Ebisawa - one of the infamous animators of DBZ
Setsuko Nobuzane
Toshio Deguchi - who has a very similar style to Nakatsuru
Masahiro Naoi - one of the prominent animators of Saint Seiya
Thank you for your explanation. Somehow I imagined it was related to the budget, but from what you say that's not exactly the case. Sailor Moon has always felt like the odd one to me because other anime I used to watch repeatedly (Cardcaptor Sakura, Pokémon Indigo League, Magic Knight Rayearth and even Digimon) looked much more consistent. But now that I see that Digimon Adventure also showcased different animation styles, I wonder if I would notice inconsistencies on the other shows as well, if I watched them more carefully.
I remember way back in the day (around 2008-09), GAME ONE which was a French channel that got the rights to premiere the Naruto (and later Naruto Shippuden) episodes before they were released in video format (and considering back then streaming wasn't a thing and even watching on illegal sites wasn't a mainstream thing for kids/teens - they were basically introducing the series in France), they did an exclusive interview about the production of the anime and it was said that the episodes that boasted incredible animation (namely the Sasuke vs Orochimaru/Sasuke vs Naruto fights) didn't have any special budget but it was just the animators having a lot of fun and going free style.
I would suppose that the fees between, for example, the Nakamura and Kagawa teams were different however in the end it all depended on availability of those teams more so specifically on a budget.
The more prominent animators would be, of course, reserved the season opener and finale as well as major episodes (like the appearance of HaruMichi, Grail etc...) but the rest depended on who was available at what moment.
I remember the director of Saint Seiya Omega Season 2 (that series had a chaotic production schedule with the directors changing mid-way) revealed that they prominently used an Animation Director (I don't remember his name but he was very average, basically like Nakamura - very retro style and janky anatomy/movements but with a little bit more dynamic animation). They used him a lot because he was super quick and could finish episodes very fast so he was given the most episodes because of the hectic schedules with episodes' scripts being (probably) rewritten quite often.
So, in the end, there's a lot of factors involved.
Kyo Ani is a famous studio who allows it's animators to learn and improve uniformly as a team. Despite not making a lot of animes per year, their quality is very high, nearing movie quality for TV shows.
Pierrot has also invested into an in-house studio to produce movie-quality series, which I think the Bleach's 3rd and 4th cours will be produced from.
With today anime packages being 13 episode cour (or the very rare bi-cour of 20ish episodes), it has allowed for more uniformity for the series' art and it would simply be ridiculous for a series of 13 episodes to have 5 different art styles.
However, there are still small fluctuations in between the Art Styles.
Akira Takahashi on Crystal III - Expressive eyes, stylish line-art, cuter faces, athletic bodies.
The famous 6th episode. There are actually 2 animation directors on this episode: Aya Nakanishi and Yukie Takayama.
More angular faces, more detailed hair and different shadows.
Toei remains the last studio who currently releases several episodes every week and unfortunately Precure doesn't show much diversity in it's art.
The only one that sticks out are the episodes of Yuu Yoshiyama.