Aizen wins. Pretty handily at that.
@DBZ_universe: I doubt it.
@katanalauncher: She was kicking Kenpachi's ass, but I don't see her stomping half a dozen vizards and captains in the space of about 30 seconds as he did (especially with Shinji and Shunsui among them). He was also strong/fast enough to make Ichigo look like a joke (pre final power-up).
That's due to Aizen's shikai ability.
Outside of Shikai and hogyoku Aizen hasn't shown much that place him above the stronger Senior Captains.
In base he was overpowered by Isshin, while in first stage of hogyoku transformation he have trouble with the FKT trio.
The most impressive feat he has is stopping a exhausted ichigo's sword just after he mastered Bankai.
Urahara/Shinji/Isshin are all able to damage Aizen, and Unohona is more impressive than them being the best swordsman with a bankai that can seriously damage Aizen.
She was even hyped up to be on par with the Royal guards.
No, it wasn't due to his shikai ability. He released it and then proceeded to blitz/curbstomp the vizards and the captains in about 30 seconds.
Remember when Aizen stopped Ichigo's attack with his finger?
Remember when Aizen brought Grimmjow to his knees with reiatsu alone?
Remember when Aizen proved himself leagues above Ichigo after the latter arrived at the battle?
Don't try low-balling the guy, Aizen is still a beast without his shikai and the hogyoku. Shinji was stomped, and it's clear that Urahara and Isshin are well above the captains. Unohana is better than them? Bullshit. Sorry, but that really is crap. Kicking Kenpachi's ass is the only thing she has shown, and if you're going to argue that Ishin/Urahara couldn't have done the same then don't expect to be taken seriously. On par with the royal guards? Scan please. And honestly, even if she was, Ishin and Urahara are likely on that level too.
But of course, even if Unohana's stats did outclass Aizen's, he still has his shikai to fall back on.
As far as I'm concerned, Aizen>Unohana>>any of the captains apart from Yammamoto.
@GIRUGAMESH: Kubo stated that Kyoraku's Bankai is enough to beat Base Aizen, so Unohana should be able to win since she is stronger than he is apparently.
@LHWKnight: can i get the link to that also if your right than Unohana wins against base aizen because writer is God when using his own characters, so if he said so then it must be true.
The interview was conducted in 2007 or 2009. You can just google it and you should find it on Narutoforums's Soul Society Pit.
and Unohana has more than sufficient base feats to murk base Aizen. You don't need any implications from the author to see that.