Both are superb old time close range deer cartridges and both will handle much bigger game in their respective ranges. I personally see them as equivalent cartridges even though there's quite a difference in caliber.

They have similar range (roughly 100 yards or a little more) similar recoil and are chambered in the same leveraction rifle.......the Marlin 336.

The .35 Remington and the .30-30 Winchester are both superb woods cartridges for the wily whitetail.