Chowder is better than both, for it's obscure sexual references.
Adventure time and regular show are FULL of that as well.
Heres what I can think of off the top of my head
In adventure time:
-a woman tries to seduce a tentacle monster
-an elephant dies, and then returns as a vengeful pedophile
-Finn is forced by gnomes, to get in a small glass case and poledance.
-A demon turns into a gigantic penis-monster
- A vampire is called a ****.
One of the characters was tied up, and raped by unicorns. On screen. Blatantly.
I laughed so hard at the regular show part XD XD 2 million win points for you good sir
Anywho, I prefer Chowder and Flapjack.
Shame both were ended, I don't like most of the newer shows, such as MAD, for it's lack of comedy, references to celebrities, and other shows or movies. I occasionally watch Regular Show and Adventure Time, but I don't watch television too often, anyway.