As Ravenisawesome has said, it really depends. Some are better in anime form, and others are better in manga form. Personally, utilizing the best of both worlds is the way to go. Do away with all the silly "elitists" that try to sway you on one side or another, and just go with the flow. I can understand preferring to experience Dragon Ball Z in its manga form, for the anime itself is quite filler-ridden and thus a painful thing to sit through per battle. Goku's battle with Frieza on Namek took a whole month to end. Ugh.
Now, how about some great anime? Like I said, manga usually sidestep the filler moments, because for the most part, anime tend to be produced under a set amount of time while the manga are still being published. That explains why Fullmetal Alchemist: Brotherhood, for example, was set to replace the original anime.