If i had to pick one of the three it would be a 30-06. The 270 is close behind but id like being able to comfortably take the rifle for larger game then deer. Never shot a 7mm-08 and dont really have a need to own one. The 30-06 is your best choice if you have any chance of hunting larger game if not then get the 270, Its alot easier on your shoulder at the range.