Either one is fine.. Its the same cartridge just different caliber. 243 is a necked down 308. Your likely going to be shooting 85-100 grains out of the 243 and 150-165 grains out of the 308 which will add a little more recoil with the 308... I would say, if pick the one that would fit most of your future hunting needs other than deer... Varmits then go with teh 243, Elk or Moose go with the 308..