I prefer Manga because I hate fillers and in my opinion a lot of details get lost in the Anime. Sure it's nice to see his favorite character animetated and hear their voice. Except for Shingeki no Kyojin/Attack on Titan. I'm reading its manga but the Anime hasn't disappoint me like a others. We'll see how it will continue.

Manga, pure and simple straight from the creator's ideas! Always loved the old traditional manga too!

Now, I've only really gotten into one anime at the moment, and I haven't really read any manga, so... yeah