Of course, more of you know Naruto more than Bleach, so you're probably all going to choose Naruto. =__= Naruto is also older than Bleach, as well as longer in terms of both anime (if you count the two Naruto series as one) and manga.
Not that I don't like Naruto anymore, but the anime... well I just couldn't watch it anymore. I dunno why. Part of the reason was the fillers, though of course I could have just skipped. I am still stalking the manga though, and a lot has happened recently. o_o;
But I just find Bleach better than Naruto. I'm not sure why. Both series' fighting scenes are pretty cool, the plots are interesting, and characters are equally annoying and entertaining. Emotional scenes? Well, Bleach isn't so emotional at first but later on in the series, you'll find many deep and moving scenes. Naruto also have deep emotional scenes though.
Guess one thing is that Naruto has WAY too many fillers. Bleach really only has two major filler seasons and some pointless episodes. But at least the two major fillers that pretty much took over two seasons were entertaining. The Naruto fillers are pretty much pointless 95% of the time. I'm certain the manga is well ahead of the anime now, so anymore fillers and those who still bother to watch Naruto Shippuden will go mad.
Perhaps in terms of character development, Naruto pretty much only focus on the major characters - Naruto, Sakura and Sasuke. There are others, but they're normally only shown in the anime fillers or aren't shown much. Bleach's character developments are pretty much shown in many characters and are more, well, interesting. They play bigger roles in the Bleach plot than Naruto's ones with their plot.
Speaking of characters, I guess Naruto doesn't seem to give much focus on the other characters besides the main ones, whether they're the good or bad guys. Bleach, on the other hand, do let us see more of the side characters and let them be more involved in the major plots.
I know this point is useless, but the Bleach dub is a lot better than the Naruto dub. XD Yes, they are both made by VizMedia and are both not as good as the Japanese, but Bleach's dub is more bearable and suited than Naruto.
Another pointless point is the art. I just like Bleach's art better. The only complaint I can think of is that Tite Kubo makes some characters too skinny. >.> And the heights that were mentioned in a Bleach data book seem off. e.f. Soi Fon is only 150cm, Orihime looks way taller than me yet is 156cm. Naruto is more realistic, but for some reason I don't like art so much sometimes.
ANOTHER pointless point are the songs. XD I like the Bleach opening/endings more than the Naruto ones, as well as the OST music that occurs in the anime.
I find Bleach funnier. Yes, Bleach and Naruto have their serious moments, but I find Bleach more comfortable and comical.
I basically have little reasons why I like Bleach better than Naruto. But I just think Bleach is better than Naruto. XD I saw Naruto before Bleach, but as soon as I started Bleach and went further into the series, I pretty much abandoned Naruto altogether.