Huge difference in range, power, and accuracy potential. 30/06 is far superior to 30/30 in al regards.
Exactly.
The real good thing about the 30-30 is the nice handy lever action carbines chambered for it.
The 30-06 in a good bolt action is one of the all time great cartridges. It can, depending on the individual rifle, be very accurate and is effective to at least 600 yards. It will kill at far greater range than that.