Obligatory shoutout to !anime@ani.social if you want a more anime-focused discussion. Of what I have watched (or seen enough of to make a judgement) there are a couple standouts. Note that I haven't really watched much western animation in recent years.
- Frieren: Beyond Journey's End - !frieren@ani.social
- The Apothecary Diaries
- Heavenly Delusion
- Delicious in Dungeon - !dungeonmeshi@ani.social - This one is done by Studio Trigger, so it is a bit stylized, but I adore the animation in this series
- Jujutsu Kaisen - I haven't watched this, but I have only seen tremendous praise for season 2's animation (despite the studio's working conditions)
- Demon Slayer - another show I haven't watched, but have seen plenty of gorgeous clips
Wildcard answer would be Star Wars Visions. Each episode is done by a different animation studio, so it can be up to personal preference as to which ones you like, but there are some great showcases in the show.
Edit: If you care a lot about animation quality, I would recommend checking out the SakugaBlog. It goes into deep dives on Japanese animation. For example, they did a whole running series on Frieren (link to the first article).
The AniList listing is there, but since it is NSFW, it will only show if you are logged in and enable 18+ content.
You got me to check out the AniList 404 page though, and it is really great.