Anything legal for a first deer.
After that, 3.5 or older.
1-2 does harvested per buck.
From our observations, we have a pretty good sex ratio with our deer, and have seen a lot more shooters or near shooters. It makes your time in the stand much more enjoyable, and it will only get better. This works for us, because we hunt a fairly large tract with light pressure, I don't judge anyone as long as they follow the regulations and are doing it for the right reason.