Next time you can help us by making your thread title more descriptive
The i7 will very most likely have more RAW power, but remember OS X is lighter and can utilize that power better. In a real world scenario I can't tell you which will perform better except that OS X crashes/hangs less and is cleaner and smoother. That's all the input I have, I can't decide for you and I haven't tried both side by side.
Depends on what you are doing.So i5 on osx is faster than i7 on window 7?