Like said flip a coin both are fine cartridges. OTC ammo is readily available for both, however the .308win has an edge in this department.

I prefer the 7mm 08, it has slightly less recoil and flatter trajectory.(BTW when comparing carts. to get a more accurate read on ballisitics you need to compare similar sectional density bullets. ie: a .284 (7mm) 140gr & .308 165gr have the same SD of .248).