They are both low cost Linux single board computers($9 and $35, respectively).
They both have Wi-Fi and Bluetooth.
So what's the difference?
Here are some good and bad speculations about C.H.i.P and Raspberry Pi 3
+-510 megabytes ram
+- On board storage 4 gigabytes
-composite video out only,HDMI adapter costs $15
Raspberry Pi 3:
+HDMI and composite out
-no onboard storage
CHiP with its lower cost and onboard storage,it is the best choice for someone looking for a cheap,good computer.