As you probably know every rifle is different.
I have had great luck with the Game Kings. I was talking with a tech at Sierra and mentioned my rifles preference for the Game Kings over the Match Kings and that it put the Game Kings all into one hole over and over again. I'm pretty sure it prefers the different ogive on the Game Kings for some reason. (Old flatback 116 in 30-06 putting 10 into .446)
He confirmed to me that I'm not the only one whos rifle prefers the GKs over the Mks.
Whatever your rifle likes best, when you find it, just shoot it.