Neither. Cartoon Network had some good cartoons, but none beats timeless classics like The Pink Panther and Bugs Bunny, both of which were featured on Boomerang if I remember rightly. Samurai Jack looked fairly shit to me as a child, from the little I seen it was pretty boring. I haven't even heard of the other one, but it doesn't sound particularly good either.
Nope, I'll sit here with my timeless shows: Chigli (I swear to God, if you haven't heard of Chigli, Camberwick Green or Trumpton I will stab you in the throat), The Pink Panther and almost every Looney Tunes cartoon.