There is no different in range of the two radios. 1 has 6 channles and the other has 7. The 6DX is a top notch full rang radio and is used for things other than park flyers. The sending speed and strngths are the same. The difference in what a park flyer is that you get micro servos and batteries in the package. The micro servos would not have enough strength for a .40 size bird. The receiver and transmitter would work great in other things. You would only have to get bigger batteries and servos. The bigger radios usually only differ in that they have more programs, end points and mixes. Yes, the Futaba in a great radio and worth every bite of the $199. I use Futaba and JR and plan to upgrade to the 2.4 modules.

Hope this helps

JIM