yep gotta be one piece..
Hands Down 4 One Piece
idiots in their own idiotic way have their own idiotic worries. - Sakata Gintoki
My best is katekyo hitman reborn!.
One piece or katekyo hitman reborn because both are funny as hell and the action sequences and story are top notch!
Well I have to go with the majority
There are other good ones but it is the only one that could entertain me for so long and it is the reason I started reading manga, although I read Dragonball years before.