Idk, there's a sort of vibe from the sfx to production value that sometimes I really just get taken aback by. It really make those series stand out way more to me. I'd love to hear more anime that made you feel the same way.
I am so thankful for whitefox, we got full 30 minute great content filled episodes every week and made a fire ed. And their animation and attention to details were great.
ReZERO Starting Life in Another World Season 2 Part 2
Anything done by ufotable honestly. I mean, they aren't jokingly given the name "Unlimited Budget Works" for nothing. LUL
Noticeable works done by ufotable:
Fatestay night Heavens Feel III spring song
FateZero
Kimetsu no Yaiba
!Mob Psycho 100 II
One Punch Man
Violet Evergarden
Love Live Sunshine 2nd Season
ReZero kara Hajimeru Isekai Seikatsu 2nd Season Part 2
Shingeki no Kyojin
Shingeki no Kyojin 2
Shingeki no Kyojin 3
Shingeki no Kyojin 3 Part 2
Kimetsu no Yaiba
Fatestay night Unlimited Blade Works
And a special mention for David Production, for the spectacular changes they make to the opening in the JoJo series, It seems to me a show of love for the series.
Might be a weird example because this anime was made with an extremely low budget. But I could tell that this small studio tried to make the best anime they possibly could with the budget they were given and it ended up being a wonderful story. I could feel the heart and soul put into it more than any other anime I've watched.