I would prefer the '06 over the 308. I must be crazy but I am just not a fan of the .308. I love the 7-08 and .243 but not the 308. That would be my first reason. The second is the longer case of the '06 makes it better to handle the heavier bullets should you decide to use them for bigger critters. I mean the bullets over 180 gr. The 200 and 220 grainers. They would have to be seated too deep into the .308 case to have them reach their full capability. (same could be said for loading a 175 gr bullet into a 7-08 case.)