Once you start upgrading the MacBook Pro, you'll get a ton more power than the MacBook Air. At first glance, the base model of the MacBook Air and Pro may look more or less the same, but it's important to note that a quad-core processor will offer significantly more performance than a dual-core one - and a 6-core chip at that will be even more powerful. As you can see, there's a major difference in specs between the MacBook Pro and MacBook Air.
