Stay with the .270Win. Greater variety, and I suspect better availability, of factory ammo with the .270. I'd give the edge to the .270 for long shots also. As to recoil, I've found them about equal, but then a lot depends on the rifle/stock design. A good way to judge potential recoil is to just look at the corresponding bullet weights & velocity. The most common used in .270 is the 130 or 140gr. The 7-08 uses 140gr. Ten grains of weight difference, if applicable, isn't going to make much difference in this case as the velocities are pretty close.