Crabtree or Fitz ROS?

I have Crabtree but I can get Fitz in a trade if I throw in some handcuff rb's the Fitz owner wants. I know Fitz is the better receiver, but Palmer doesnt' look that great this year, and the Raiders are throwing the ball all over the place, and Crabtree is the main target in the redzone.
This should be easy to say Fitz, but I have my doubts, and could see them end up performing equally. Makes me wonder if it's worth giving up the handcuff of Gillisle and then Ajayi, to trade Crabtree for Fitz.

What say thee?