Imac or Macbook Pro Retina?

I have a hard time to choose between the new iMac and the MacBook Pro with retina display 15-inch! I do a lot of photo editing and som video editing, and i travel sometimes. I have today a 13-inch MacBook Pro. So my question is; should I go for the retina pro and sell my old MacBook? Or should I keep my current 13-inch and by a iMac? Let me know what you guys think?