Some estate planners advise that a couple’s money should run out upon paying the final expenses of the second to pass, representing the optimal balance of work and enjoyment of life. The .308 sure echoes that sentiment in the “1,000 yard” game. That’s with ammo that is nowhere near COL for a true spec .308 cartridge, an often overlooked technicality. 168’s wouldn’t be the only casualty with spec .308’s. And far between are longer ranges than 1,000 yards, traditionally, so the “lane” the .308 needs to stay in is a long one, but at 1,000 they are coming into the pits on fumes.
I just want to add that competition is just a form of training. Whether we do it alone or in a group. I choose the 30-06 because I shoot everything with it so I practice and train with it. I have a 6.5 creedmoor and it is more accurate, but it is not as effective for my needs, and not as satisfying for me. That is why I said, it's not always about winning.
You've narrowed the choices down to two, pretty good reasoning so far. Pick one, you've a 50 -50 chance being right. Don't feel too bad if you're wrong because people who use both once or twice a month often get them mixed up.
