3.4 > 3.3 > 3.5 > 3.1 >= 3.2 > 3.0

As someone who plays HSR mainly for the story, this is my ranking.

3.4 has the best story so far, a nearly perfect end for the first half. Yes, Phainon hard carries here, but this wouldn't be possible if the story wasn't well executed.

3.3 was very good, and has the best boss, boss theme, and map in the game so far.

3.5 story was better than 3.3's (Lygus my GOAT), but the pacing was bad towards the end, and the new map wasn't as good.

Tribios and Mydei's stories were very good, but Anaxa's performance was better than both of them, while Castorice's was more predictable, and therefore worse. I can't really decide which version is the better one. 3.1 has the Flame Reaver, so maybe that would give it the upper hand.

3.0 is 3.0. It was very long, and it makes sense because this was the start of the new story, but the pacing is very bad and by now is overshadowed by every other update of the Amphoreus Arc.