[Chad ThunderCock]

Currently reading Kenichi history strongest disciple and wanna start with D Gray Man next, manga or anime which is best? (also anime s2 will come out soon)

[Omoi]

Not seen the manga and didn't like the anime hopefully the new one with be better

[Mafty Navue Erin]

Up to your personal preference. I enjoy anime over manga. You'll probably get more details from the manga though. Just if you watch the anime it will end in a bit of a cliffhanger. If you were one of the people who followed it 8 years ago, then you might think the manga is better.

[Desolate Night]

I've liked the anime and after anime I read the manga so I think you should do it in the same order.