Having seen dozens of anime, i can easily say that Bleach has the best fights even between the "big three" ( Naruto, Bleach & One Piece ). This is the first time that we encounter Kenpachi Zaraki as viewers. He is so strong that he has to put an eye patch to decrease his strength, bells all over his hair to locate him in order for his opponents to know where the heck he is. His zanpacuto doesn't has a name so Zaraki is fighting on his own 'cuz his spiritual pressure is too strong for a katana to contain, or at least until this very moment ( we get to know more about him in the late episodes of Bleach). On the other hand we've got the MC which is Kurosaki Ichigo. With old Zangetsu fighting alongside with him, we get to watch the most potential character in this Anime fighting with the 3rd Kenpachi, the current one (we'll know later about that "Kenpachi" term). Ichigo in order to save Rukia has to pass Zaraki . So we see a fight between potentiality and raw strength. Ichigo with his hope and potential Vs. Zaraki Kenpachi with his unrealistic strength. Ichigo and his zanpacuto: old Zangetsu Vs. Kenny (Kenpachi) with his cute lieutenant Yachiru watching him enjoying fighting to death. Ichigo dies once and his zanpacuto gets destroyed by sheer power then old Zangestu lends him his own power & gives him the same zanpacuto fixed then we see potentiality beats RAW STRENGTH . We see friendship Vs. Bloodlust, the promise to save Rukia Vs. Sad Reality applied by Zaraki. I've seen like a million fight in different anime like Demon Slayer, JJK or Black CLover, and all i can tell you is this fight between these two characters, a deed of some genius named Tite Kubo (Bleach's Writer) is the G. O. A. T
IDK if i'm being biased 'cuz Bleach is my fav anime, but in my opinion this is the greatest of all time in all anime history.