I am very indecisive about Adventure Time and Regular Show, as I highly enjoy them both, but I think I'll vote for Regular Show, because it reminds me of the good ol' days of Adult Swim and because it kinda reminds me of myself in my last job
Also, surprisingly, Ben 10 has gotten a lot much better as time passes, the show matured a lot since the campiness of the first couple of seasons and Generator Rex isn't too shaby, I like the fact that he's a latin "hero" without any single stereotype, also I like the design of the monsters and the overall feeling of the show not taking itself too seriously, kinda like Spider-Man, without being Spider-Man.
As for some of the other (kinda) older shows, I'd
really like to see a return of Symbionic Titan, seriously, Gendy Tartakovski is a man of pure genious and, right along with Samurai Jack, it has ben the best thing he's ever made.
So yeah, I've been a
huge fan of Cartoon Network my entire life, after all these years, it's the only kid's station I don't feel ashamed of watching and I still enjoy most if their shows, despite taking a kinda different route since the "good ol' days" (end of the 90's, begginnings of 2000's).
Heck, I feel much more ashamed of watching MTV than CN itself.