All of the above. When I was really little, I would watch a lot of PBS Kids—namely Arthur. When I was a bit older, it was Nickelodeon, amd/or Nicktoons Network. Avatar, My Life as as Teenage Robot, Danny Phantom, Fairly Odd Parents, and classic Spongebob (back when it was good). In my later teens I’d watch a lot of Disney Channel, mainly for Good Luck Charlie. Then as an adult I’d pop on Cartoon Network every now & then for Amazing World of Gumball, and of course, Steven Universe. Edit: Didn't see the "the most", somehow. I would say overall, probably Nickelodeon, but really that doesn't feel like a good answer to me, because--as listed above, I watched different channels at different parts of my life. Also, pretty sure 4Kids had a decent view time as well. I believe that's where they originally aired Pokemon, and I know I was a huge fan of the Pokemon show for the first three generations. Yu-Gi-Oh, too.