Oh, I can't even begin to pick a favorite. I'm 27 and I still only watch cartoons. The only two shows I watch with real actors are Leverage (which is no longer on) and Person of Interest (which, with the way the plot keeps going, I'm starting to wish I hadn't started to). Real life shows are too depressing or too mean. I'll just turn on the news if I want to hear about some psycho gunning down innocent people.
As for the cartoons, as I said, I can't even begin. How about I just list all the ones that I have collected?
Teen Titans, Avatar The Last Airbender, Justice League Unlimited, Young Justice, My Little Pong: Friendship is Magic, Shakugan no Shana, Sekirei Strike Witches, Futurama, X-Men, Wolverine and the X-Men (cancelled before its time, NOOOOO), Powerpuff Girls, Sailor Moon (yes, I do have all the seasons on DVD, sshh), Spice and Wolf, Crest and Banner of the Stars, and Outlaw Star.
And Naruto. I have every single box set of Naruto and Naruto Shippuden currently released...What?
Shows that I love just as much but don't own (mostly because they're not out yet): Legend of Korra, Rugrats, Doug, Kim Possible, Ed Edd n Eddy, and Hey Arnold. I love my cartoons.