Most deer hunters don't shoot over 400m, and most actual shots are less than 200m. A good quality red dot will do. The 3x9 variable is overkill.
Even at three power, if you don't practice at finding the target under 150 yards, you can miss it. The narrow field of view sometimes gives you a sight picture of nothing but fur. A red dot won't - and works better under a lot of conditions. Been using one since the first Aimpoint (which I still have,) and I consider them superior.
If you consistently shoot longer ranges, then a 2x or 3x multiplier is available. In typical woodland or edge, it's often left off.