There are many "good" Cal. out there, but good for what? as in what are you planing on doing with it?
FYI Both are related, closely. The .308 was the product of a Gov. contract to develop a more efficient version of the 30-06. It shoots the same bullets at the same velocities. It is a more efficient use of resources than the .30-06. It needs less brass and less powder to do the same job. That was enough for the Mil. to jump in with both feet but it's apparently not been enough for the sporting world.
In the hunting world the .308 holds no real advancement over the .30-06. Reason being that the same reasons why the Mil. wanted it just don't transfer over to the sporting world.
It is worse because of 2 major reasons.
#1 its new and so its more expensive.
#2 It is less popular than other rounds which get the job done just fine right now. Which makes it more expensive.

P.S. Seeing as .30-06 is the cheapest deer cal. out there I decided to get a gun in that for killin them deer. It just makes sense.