So many great calibers out there. My opinion is that both are great calibers and have huge followings, so what would really be the determining factor would be the primary use of the gun and how often he plans to shoot. I know a member here that routinely shoots his .243 at around 1100 yards with great results, and takes coyotes in the 600 yard range all the time. It is more than capable. If I were planning on it being primarily a big game gun, or extreme long range gun, the the 7-08 is probably the better choice as the only downfall would be availability and cost of ammo.