It's a tough call, especially with the small sample size for Raymond and the even smaller sample size for Kulemin. Raymond's shown a lot more offensive flair and he has the footspeed advantage (he's looked great on both the PK and PP), but Kulemin has more of a physical edge and is definitely the better all around player.
In the end, it depends what they each ask for. I wouldn't want to invest much more than $2M in that 3rd line wing position, as I'd rather leave money for Phaneuf, Bolland, McClement, Franson, Fraser, Gardiner, and Reimer.