The ONLY reason for a 7mm08 is if you prefer a short action rifle.
Taken from recoil chart on Chuck Hawks website:
7mm-08: A 140 grain bullet at 2,860 fps muzzle velocity out of an 8-pound gun has 12.6 ft-lbs. of recoil energy.
.280 rem: A 140 grain bullet at 3,000 fsp muzzle velocity out of an 8-pound gun has 17.2 ft-lbs. of recoil energy.
In that situation, you're giving up only 5% muzzle velocity, and 9% muzzle energy by choosing the 7mm-08, but dropping recoil energy by 27%.
I'd say that's a good reason for choosing the 7mm-08 in some cases.