I own both a pair of Spantik's and a pair of Baruntse's and in my opinion the Sapntik's are a bit "stiffer" so although I am not a snowboarder, I would assume they might work a bit better for your application.
By the way,FWIW, I wear a 10.5 shoe / boot in almost everything and the Baruntse / Spatnik's in size 44 are just a bit snug for me.