FWIW, as only between 30-06 and .308, I don't think you can ignore the choice of the rifle. If you lean toward a simple, bolt action like a "traditional" Remington 700 or Winchester model 70, then take your pick of caliber. If you want a newer "military" or "tactical" or "assault" style, then your probably looking at .308.

Strictly personal preference, if you going traditional time-tested bolt action, I'd go 30-06, basically for the wide choices of factory ammo loads. I don't think you as easily find the same range in .308, but you may.

I don't want to start a major debate, but I understood that the .308, being shorter in length overall, was better for semi-auto feeds than the 30-06. Full auto in any man portable in either round is a bear to control, either BAR or full auto M-14. Other than that, ballistic performance is darn close. I carried a full auto M-14. No, I could not control it in full auto.

My choice was a Winchester model 70, but then I've had it for 30+ years.

Good Luck Let us know you final choices