From what you listed as requirements the .25-06 is the better choice. It makes a wonderful groundhog rifle, and it is just about perfect for pronghorn and mule deer.

Another thing to consider is that in 20 years the .25-06 will still be a successful commercial cartridge while the .260 may not. I don't see very many .260 rifles around. I think most folks that consider the .260 end up buying the 7mm 08 instead.