I think for myself it would have to be the Ichigo vs. Kenpachi battle. I think the "foreplay," so to speak, was the most delicious part of the battle to me. The suspenseful beginning - the enormous spiritual presence weighing on Ichigo's shoulders, the fear clawing at his heart of some powerful enemy lurking nearby. Kenpachi finally shows up, and it takes a while for Ichigo to finally conquer his fear and to work together with his Zangetsu and beat the crazy battle-hungry dude.
Second favorite would have to be the Hitsugaya vs. Gin battle, though it was brief, but it's the only taste of real battle we've seen with Gin (not to mention he actually opened his eyes!) - and Hitsugaya made an impressive enough showing for it to be memorable. Who'll ever forget that kid jumping into the air surrounded by a spiralling ice dragon?
Third favorite was the struggle between Renji and Byakuya. Equally as dramatic as Kenpachi and Ichigo.
Battle I would have loved to see more of would have to be the two-on-one battle between Genryuusai and Shunsui & Ukitake.
My favorite would be Renji vs. Byakuya. Just the use of their Ban-Kais was awesome and I really enjoyed the fight.
My second favorite would also be Hitsugaya vs. Gin. I thought that was a great battle and wished that Matsumoto hadn't interupted so that it could have continued (this is the only reason it's in second; it ended prematurely). I also got curious about their Ban-Kais there and just wished we could have seen them there.
Hmm, third... That's tough. XD I guess my third favorite would either be Ichigo vs. Renji (in SS, of course) or Ichigo vs. Byakuya (although, I guess I liked Ichigo vs. Byakuya more). Both fights were equally awesome, IMO, and I just whish that Ichigo and Renji could have fought with their Ban-Kais there. That would have been an awesome fight. XD And Byakuya's Ban-Kai ansd such were awesome in his fight against Ichigo.
And finally in fifth, would be Kenpachi vs. Tousen. Kenpachi was resourceful there and it was interesting to see how he fought without his senses. It was a good fight, IMO.
Edit: Forgot about Ishida vs. Mayuri. XD In that case, it would be:
1. Renji vs. Byakuya
2. Hitsugaya vs. Gin
3. Ichigo vs. Byakuya
4. Ishida vs. Mayuuri.
5. Renji vs. Ichigo
6. Tousen vs. Kenpachi
And yes, I agree. I also wanted to see more of the Genryuusai vs. Shunsui & Ukitake fight. That could have been awesome to see, but oh well.
Ichigo vs. Byakuga
I'm being very biased here, but wtf.
My most favourite has to be the fight between Urahara and Ichigo. That was the very first time we get to see Urahara getting all serious. And it's the first time we get to see his Soul Cutter
Benihime is pure ownage. O_O Ichigo seemed to have underestimated Urahara at this point too. Ichigo also was able to learn his Zanpaktou;s name here, hich just made it all the more interesting.
It wasn't really a battle, but more like a training but whatever XD
Another fave, was Yoruichi's and Soi Fong's fight. Heck, Yoruichi didn't even use her Soul Cutter yet she defeated Soi Fong. XD
Last fave? Shunsui and Ukitake's fight against Yamamoto. Those twin swords just blew my mind. XD It got me soo frikkin excited.
For me, my favourite one is the Yoruichi vs Soi Fong fight. Coming close behind is Ichigo vs Byakuya.
Ichigo VS Byakuya
I am impressed by how Ichigo managed to master bankai in three days and then go on fighting against one of the strongest captain in Gotei 13. That is also the first time we see the annihilationscape thing. Senbozakura kageyoshi is another great view and bankai. I like how Byakuya just stand there attcking and defending at the same time while Ichigo runs here and there looking for opening to attack Byakuya. If it is not because of the hollow in Ichigo, he would have lose that match to nii sama. This fight also enables us to understand the reason behind Byakuya's cold reaction towards Rukia's execution and later how he saved her from Gin. It's a great fight.
I like the Ichigo vs. Renji fight because both really did get out of themselves. Ichigo managed to improve much by this fight, too.
Same goes for the Ichigo vs. Kenpachi fight. The creepy atmosphere and foreplay definitely matches the whole scene.
Shunsui and Ukitake ( some of my favourite captains ) vs Yamamoto
Those few moments of "No talking, only fighting" where cool enough to make it a fav
Yoruichi vs Soi Fon
That last fight was so heavy, that "it does have a name..."-line gave me just some awesome movie moment feeling ^^
Yes, I agree that Benihime is awesome...Urahara is awesome, so he deserves an equally as awesome Zanpaktou.
The best fight so far had to be Kenpachi vs. Ichigo. The build up to the fight (and not to mention the amusement) of Kenpachi and Yachiru (she's so awesome by the way) running through Soul Society trying to find Ichigo, the little run in with Kurotsuchi, and to his first blast of spiritual pressure on Ichigo...it was all almost as great as the fight itself. That was the first fight where I was actually on the edge of my seat wondering how Ichigo was going to survive.
The one fight I was DYING to see was Shunsui and Juushiro vs. Yama-jii...I guess we have to leave that to the imagination.
My favourites then xD
1. Ichigo vs Byakuya - the battle which owns everything which I so to that and to the date of manga or anime xD It was good, how Ichigo shows his bankai, and furthermore, the best of all, bankai of Kuchiki Byakuya in every aspect, and his techniques. This fights owns everything forme
2. Ishida vs Mayuri - it was balanced fight. Once they stop talking, they have very dynamic fight, espceialy because of Ishida's powers in the end. He was "God" at that time, and his combo move with shoting arrow, Mayuri dodging, and than another from the top to Mayuri, awesome ^^
3. Ichigo vs Zaraki - really intersting battle, but not because of Ichigo ;p but because of Zaraki Kenpachi and his psycho. He rocks xD
4. Renji vs Byakuya - short, but interesting fight. But also that fight shows how far Renji was at that time to Kuchiki xDxD
5. Gin vs Hitsu - in my opinion very very dynamic fight (but seriously, only in anime, in manga is too short).
There are aother superb fights, but this probably are the best for me. I also remmebr some time ago, when the two episodes with fight Ichi vs Byakuya were aired, that i watched that day by day by some 20 times <maniac of that time> xD
1-Ichigo v Byakuya
2-Ichigo v Zaraki
3-Ishida v Mayuri
4-Renji v Byakuya
5-Ikkaku vs. Eduardo. 1-4 are talked about in the above posts but Ikkaku vs. Eduardo oh man was that fight awesome or what!! Ikkaku's bankai looked scary with the huge blades and cool with the the dragon releasing its dye...the blood...the cuts...just fantastic fight
Favourite Minor fights/incomplete:
when Yourucki bitch slapped Yammy
When Ichigo cut Yammy's arm
Isshin cutting Grand Fisher in half
I think Urahara vs Ichigo (while training) was a greaat battle!Of course then Ichigo vs Kenpachi and Ichi VS Byakoua owned cause it had many turnovers!!Finally i enjoyed the
Ichigo vs. Byakuya battle is the best in manga and anime
in the manga: it was ichigo vs zaraki, but somehow I was dissapointed in the animation of it (do not ask me why)
so for anime: ichigo vs byakuya