If you did that, you'd get:
Yearly returns of 1 btc: 0.27135155316606935 btc
for bustabit, and:
Yearly returns of 1 btc: 0.314836086262803 btc
for bustadice.
However considering how much bitcoin has gone up recently, I don't think people will continue wagering nearly the same amount (when measured in btc). But seems like no matter how you cut it, bustadice is offering better yields than bustabit.