I am partial to 25-06, I've had two of them. Shot the barrel out of the first one because I used it all the time. I used it for everything from prarie dogs and coyotes to long range deer and antelope.
With an accurate 115-120 grn bullet, it will surely take down deer out to 600 yds with good shot presentation. They seem easy to load for, and in most pronghorn states; they are a very popular round. Flat shooting with plenty of enengy for antelope and deer. With a 270-300 yd zero we can hold dead center of any antelope out to about 350yds, and still be holding on hair out at 400 yds. Plus it doesn't kick very hard, so we can practice a whole lot without getting tired or sore.
I have no complaints on the 260, but I haven't actually owned one either.? It would probably give you more knockdown power at the further distances, and you could get one on a short action. However, it wouldn't shoot quite as flat at normal hunting distances as the 25-06 will.........The velocity just isn't there according to the numbers I've looked at, and 600 yds really isn't far enough for the higher BC to take over and bypass the faster velocity.