Yep, usually the manga is superior to the TV series. There many reason for that. Usually it come down to how much content they can used to animated for a 12 to 24 episode series. How true they stay to the original story. A great example it is Tenjho Tenge, as good the anime was, it will never compare to the manga. Most of the stuff that in the manga, just can not be broadcast.
Then there the cast of the super long primetime show, I.E. Dragon Ball, Naruto and Bleach. if I remember right Naruto air around 7pm in japan, were most anime that we see air around 1 to 2 am in the morning. so most of the gore and blood is taking out. Also the manga is still being publish as the TV series is broadcast, that were all the filler come from. Basically they can not air material is not in the manga, it that simple. So you get the super long fight in Dragon Ball, the 3 months + of filler in the case of Naruto.
If I remember right Eva started has a TV series then they made the manga.