Sorry, I know nothing about either of those boards, but I can
say that I rode a K2 Fatbob HARD
for 13 years and it is still in perfect "riding" condition (cosmetically of course it's a wreck)! Also, I just bought a '10/'11 K2 Slayblade on an "end of season clearance" for 50% OFF
at a local shop!
I'm not sure if it would be more, less or the same come next season, though I'm pretty sure it wouldn't be available at all and I'd be settling for 20-30% off next years model. So unless you research and find out that the '11/'12 model is going to have some new technology/features/graphics that you can't live without, I'd pick one up now.