RE: 30-06, .270 , .308 which is a better for whitetail
Of the three, I' d take the .308! You couldn' t possibly go wrong with any of them though!
To confuse your pick though, I would throw in a 7MM-08. No deer on the planet would tell the difference between the 7MM-08 and the other three calibers! It will do it all with less recoil too! Good luck!