|IMO Naruto is more of a kids show..like Dragon Ball Z or Pokemon (yes its sad I know ) whereas Bleach is marketed for Teenagers/Young Adults. |
So Bleach for me...I just find Naruto gets repeditive and boring after a while.
Naruto and Bleach are targetted towards the same demographic, actually.
In Japan, they're both serialized in "Shonen Jump", a magazine for young boys. They're also very popular among young girls and somewhat among older teenagers, but (most) adults don't read this kind of stuff.