If your plan for hunting is 200 yards and out and your choices are 6.8 spc and 6.5 Creedmore, I really can't figure out a single reason to go with the 6.8 spc. If you were to say 200 yards and less, I would suggest the 6.8 over the 6.5 Creedmore. The 6.8 will take you out to 300 yards nicely and even farther and you can shoot a lot closer than 200 with the 6.5 Creedmore. This isn't in question at all. You can make both work.
Other than less recoil and a lighter gun (AR15, v. AR10), I would say NO, particularly at 200+ yards. With the Creedmore, you are getting a heavier bullet, generally a higher velocity, which means more energy at distance. The 6.5 bullet will give you better ballistics. You will have more recoil, but it isn't stifling by any stretch, and that can mean slower followup shots, but at 200+ yards, you are not going to be making rapid fire followup shots, so that is a non-issue.
If you want to start talking about 400 yards and beyond, Creedmore is going to really start to outshine 6.8 spc.
So what are you hunting and at what distances?