Intel Aero RTF with ArduCopter

Hardware
,
1

Hi,
I bought the Intel Aero RTF and installed ArduCopter as described in the following link:
http://ardupilot.org/copter/docs/common-intel-aero-rtf.html
When I open the mission planner I can see 2 sets of parameters:

  1. intel-aero-rtf
  2. intel-aero-rtf-cb
    What is the difference between them? Which one is more accurate?
    Thx,
    JustFineD