The real-world differences between .30-06 and .308 are essentially zero.
Folks can (and have) argued until they're blue but the differences are academic at best. Until you get to very heavy bullets, there's often no difference whatsoever. Check
some load data for both cartridges, you'll see such over-lap that in most cases you could never guess which one was which.
If you can't decide, roll dice or throw darts. For me , when all else is equal I'd rather have a short-action, which means .308Win (although neither would be my first (or second) choice).
It'd be hard to go wrong with a Browning
X-bolt White Gold, although the stock is real (unlaminated) wood. Their composite
3D Bird's Eye Maple is cool too.
The X-Bolt is an excellent firearm and would serve you and your descendants well for generations.