.270 vs .30-06 which should i get.?

I am going to get a rifle tonight with my birthday money. I am turning 14 and i am not sure which to get a .270 or .30-06. The thing that worries me is the recoil of a .30-06 because i will be doing all of my shooting prone with a bi-pod. I want to try to do target shooting at 500 yards maybe 600 max after lots of practice. That is a short term use. In about 10 years i hope to move out west and hunt, because in indiana where i live you can't use rifles like this to hunt. Which would be more sufficient for about elk to moose sized game more likely just whitetails and mule deer? I can easily handle a 12 gauge slug out of a 5 pound 11 ounce single shot, but i am not shooting prone and this worries me because at prone you absorb more recoil. Also i heard that the .270 has a better trajectory then a .30-06 and that is a big key to my decision. I want something that shoot relatively flat. I want to get a gun that i will be able to use for the next 15 to 25 years. I already decided what type of rifle and am not going to get any caliber besides .270 or .30-06 because that's all that the gun store here has. I am not the biggest kid 5 foot 4 130 pounds and i am not sure about a .30-06. If i can handle the recoil then that's probably what i will get but if i can then .270 is what i probably will get. Also as i said before trajectory is the 2nd most important factor to me besides recoil.