If ammo supply/cost is same/same, the 6.5CM buys you reduced recoil and sleeker bullets for longer range connections, while the .308 buys you more whoomp on flesh out to moderate ranges and slightly longer barrel life, at the cost of more recoil. Depends on what you are looking for. For more of a playtoy that is also going to the hunting field, I'd likely go Creedmoor if available.
