This old fool also prefers a 30-30 over a 243. I'm sure the 243 is okey in some situations, but I have found it to not take the brush well. I often hunt with a 270 (not a good brush gun either), but when in the thick I opt for the 30/30. I would say that the 30/30 has definatley taken more deer, if for no other reason than it's popularity and the length of time it's been around.
If I could only keep one rifle to put meat on the table it would be my 30/30. I traded my 243 last yr for another 336 Marlin 30/30. My 06 and 270 are good for way out there and my 30/30 is enough gun for close places even tho I know it is good for 150 yds.
So imo the old guy was right and you might stand to learn something from him.