I've never played with the .260 but can tell you that you wont notice a real world hill of beans worth of difference between the .308 and the 7-08 except when you go to buy ammo. I got out of the 7-08s a while back just for this very reason. .308 is much easier to find and typically much cheaper too. At most practical hunting ranges the trajectory is close enough to be negligible on a shot to the vitals and the recoil is indistinguishable to my shoulder.
In my opinion not enough difference to justify the hassle unless you just want one.