I prefer the 270 because I mostly deer hunt and it just seems "right". Probably not much flatter than the 30-06 and I'm not going to bore anyone with meaningless mathematical minutia. I just think its "just right" when it comes to deer hunting.
I have used the 30-06 and it works fine and I'd admit that its probably a bit more versatile with heavier bullets on bigger game like elk. But, if you don't need that, why not go with the one you like?
I like the 270.
