Hmm..I'll go with Tosen here.

Like both but I'm going with Byakuya on this one.

It's too bad really, I like Tosen. Byakuya, however, is one of my favorites.

I can't find myself choosing Byakuya over Tosen in any situation. I mean, Byakuya's awesome, but he has no personality. He smiled all of two times (to my knowledge) where as Tosen, while also lacking any personality for a lot of his face time, has pounds more zeal than Byakuya. He just needs to figure out what the hell it is that he WANTS! I mean, he should find out if it weren't dead...

I enjoy Byakuya's character. Tousen is okay, but the way he designed really annoyed me. Kubo-san made him into a major hypocrite... He was supposed to be fighting justice and aiming to the least amount of blood possible. Instead, he cuts Grimmjow's arm off (I was unimpressed by that, Grimmjow is one of my absolute favorites), then ends up using Hollowfication and losing sight of reality... All-in-all, he ended up a pwan of Aizen's, which was further infuriating. He could have been so much cooler.