Probably not much difference between the 2......and thinking off the top of my head, believe the 30.06 to have 5 "pro's"...
1. 30.06 factory cartridges are probably one of the 3 most common centerfire rounds available. You can find them anywhere that sells ammo.
2. 30.06 factory loads are available in a large variety of weights, thus, something for most every situation.
3. 30.06 can shoot a heavier bullet........220 grain commonly available while the 280 a 175 grain is the largest I've seen on the shelves locally.
4. Military surplus ammunition is available at low cost for the 06.
5. Because of the above, if you don't handload, the 30.06 will be cheaper to shoot so you can practice more with it for the same money.
Darn.......I've about talked myself into a 30.06!!!!! The old round really has a lot to offer doesn't it?