I have a little experience with the PDC and the Rebel, however most of my experience is with the PDR. As far as teh differences between the two frame...They are totally different frames, designed IMO for people with totally different games.
Power: the PD has what I call easy power. The frame is stiff and it has an open string pattern and a larger head, which in most cases means the frame was designed to be a power frame that power comes from very little work on the players part. I believe that the Rebel has equal power, but the Rebel's power some from the weight of the frame, however its a matter of how fast the player swings the frame. The has "plowthrough" like crazy.
Spin: The PD open string pattern and slight head light balance make it a spin friendly frame. The Rebel's balance about 9 points gives it a nice whip like feel and swings lighter than any 120z+ frame I have hit with so far. But when you compare the two the PD comes out on top hands down.
Control: Hands down, without a doubt the Rebel takes this one. The tight string pattern and the really nice flex helped me really put the ball where I wanted.
Feel: Another area that the Rebel shines. The PD doesn't have a feel that I enjoy and while the PDR was a bit more solid, it didn't comes close to the Rebel.
Groundies: Here about equal, depending on your game style. Both are great frames.
Volley: Rebel hands down winner. Solid and just destroys the ball, while the PD was a bit unpredictable.
Serve: PD hands down. Not many frames can come close to the PD when it comes to serve. But the Rebel really fire bombs as well, and where you loose a bit of pop, you can put the ball a lot easier in the court where you want with the Rebel.
Comfort: Rebel by a long shot. Able to go full poly and not feel a thing in my arm. PD very strings sensitive if you have a sensitive arm.
All in all the Rebel was my choice of frame for a good while after I ended my relationship with the PDR (shoulder issues). If you do decide to go with the Rebel, give it time to get used to the weight, but after you do it will be smooth sailing. At least the was may case. Hope this helps.