Gah, hard decision.
SnowMan: Bigass gap. Looked hard getting it from the other side though you should've landed on something for bonus points.
Rusch: An easier double bump but you added a nice precision landing and used a slower bike.
Both stunts are completely different yet awesome in their own way so it's hard to come up with a vote. I guess if we compare the actual double bumps SnowMan's would be harder to perform, so my vote goes to him. But barely.