Nothing beats freshness. You can grind your own deer, pork, beef or whatever. It reaches it's prime in a day or 3 when the spices/herbs kick in. I have learned that pre-grinding, adding spices/herbs and freezing is a slow decline in flavor. Pork added to venison will go rancid in a couple months in the freezer. As I get older and wiser, I just cut up big chunks of deer roast and freeze. When I'm ready for some good ground burger or sausage I thaw it out and grind with pork fat, beef suet, spices or whatever flavor I am after. Then it's straight to the smoker, grill or CI. It's funny growing up and watching the older men making huge batches of sausage on a mission. I have done it for years thinking it all needs done up front for later use and freezer stock. Now I just take my time and get a flavor in my head. Take out a package from the freezer, add some fat, some herbs and it turns out so much better than what was sitting in the freezer for 3 months.