MacBook Air is known for its lightweight and compact size. It is available in 11.6 and 13.3 inch screen sizes. And it offers a very good battery backup (~12 hours). MacBook Pro, on the other hand, is more powerful and is heavier and bigger than MacBook Air. It comes in 13.3 and 15.4 inch screen sizes. MacBook Pro is also avalaible in non-Retina Display option. There is new 12 inch MacBook powered by Intel core processor. It is even lighter and thinner than MacBook Air and is available in gold silver and grey color options.