Say what you will about storyline or whatever, but Bleach has the best artwork among the three. I couldn't get into One-Piece because I just cannot stand the artwork. It may be a matter of taste, but meh, I really don't like it. And Naruto...yeah, what Kalistean says about how the males are portrayed as prettier than the females is correct. Learn to fucking draw women, Kishimoto. So, I watch/read just Bleach out of the big three, mostly for the prettiness factor. Tite Kubo was a fashion designer before he became a mangaka, so his women and clothes are excellent.
Story-wise, I suppose I can concede that One-Piece makes the most sense. But honestly, the characters annoy me to death, and so do the characters in Narutard. In Bleach, they may be annoying, but each character is relatable in a way, even the enemies.
Yeah, I'm a Bleach fan. Bite me.