Lets see what happens resurrecting this thread two years later...
I own both and think they both are amazing games. I agree with BSD taking longer to be understood. A thing not often understood is that the angle is what enormously impact how hard is BSD: at 6.5 and above is a bitch, too much frustration, really too much. Around 5.5 a hard game, but not so extreme. True, wh20 is more kind of joyful pinball fun. Dont touch BSD if you are not really dialed in! For me is a draw, so I do not vote.