Box2d Vs Chipmunk

Hello,
I want to create a very simple physics based game using cocos2d JS. I am not able to decide which physics engine should I use? Box2D or Chipmunk. Can anybody please guide me? I have read the tutorials of both the engine but which one should I use?
Thanks
crackprac

If your game is a “very simple physics based game” then use built in physics in cocos2d-x.
for complicated physics I prefer box2D.

is there any tutorial for how to use built in physics in cocos2d javascript?