If they got the worst of both generations, it would have been unfair because the Millennial team would have 10x the number of contestants.
JEDIT:
Sure enough, playing up to the stereotypes, the Gen Xers pick the scuba gear that requires more work to see the benefit, while the Millennials go for the chickens so they can just sit back and eat.
I think they just had a larger pool to pick from with the Millennials.