I don't have a Creed, but do have a 260 and 6.5x47 - there is so little difference, period.
Altho the 260 has a bit more case space, the other (Creed and x47) can run higher pressures than the 260, and hence similar performance. The x47 (and Creed) with the 30 degree shoulder have all the advantages of that (easy tuning, less trimming, less powder for similar performance) over the 260.
If you get a 260 barrel that shoots 140's in the high node, you're set! but my experience (and buddies) is that the CM and x47 perform the same with 130-140 gr loads.
As for factory ammo, Creed is where its at. Hard to find 260 factory, and 6.5x47 is a reloader cartridge.
I am not a kool-aid drinker, but i do want to try the Creed - i was so very impressed with the x47 that i have to try the CM. The 6.5x47 and 6mmBR both gave me those WOW moments that i didn't get with any other cartridge/rifle combos that i have owned - Initial load testing with both rifles was crazy - the worst groups were all under an inch at 200.