Hrmm, what to do? I played 1 Birthright game, it was enjoyable as a change of pace, but didn't grab me and make me want more. I loved the Fritz Leiber novels, but never played the D&D setting. And I played most of the Basic/Expert modules of the 80s, but never explored the Mystara beyond those as we quickly moved to AD&D and Greyhawk....
Time to vote Grog!
Birthright 7 Just to make things a bit more even
Lankhmar 6
Mystara 5