Humor-wise, both are great. Both can have you clutching your stomach and rolling on the floor in insane laughter. However, Naruto's humor is somewhat slapstick sometimes as compared to Bleach's more refined and natural humor. But then, you have to consider that the characters in Naruto are mostly kids and are younger than the characters in Bleach (not considering Shippuden).
The fight scenes in Naruto are way more interesting because it dabbles more in strategy rather than just the simple clashing of swords. However, because there's much strategy involved in Naruto's fight scenes, you also get to hear a lot of long and winding explanations in between fights and this is something that the some fans who are in for the action dislike. Bleach's fight scenes are also great and action-packed but are rather repetitive.
