Macbook Air or Lenovo Yoga 2 Pro?

I'm a college student (engineering major).

Macbook Air 11", i5, 128gb ssd, 4 gb ram: $800+

Lenovo Yoga 2 Pro 13.9", i7, 256gb ssd, 8gb ram: $1100+

Lenevo Yoga 2 Pro11" i5, 128gb ssd, 4gb ram: $700+

Which is better option?

To me better off with a macbook air, though i like lenovo i really think macbooks are better for science majors as a matter of fact good for college students