I aged both sets of mine out at 5-6 years, but I do that for regular tires as well. It depends on how they are looking, and how close Winter is.
I used to run Hankook DH01s. I now run Toyo M655s. I feel they are a much better riding tire than the Hankooks. It was noticeable on the first drive which was empty. Also, the fronts wear better compared to Hankooks. However, I did like the Hankooks enough to put them on my F450 after running them on a F350 SRW for several years.
Obviously, the Toyo tires cost a lot more, so maybe they should be better. ;)