Here's a copypaste from another thread asking what the pros/cons of an Apple handheld device was versus an Android one, I think the main points here still apply to their laptops, here ya go.
Pros of an Apple device: Sleek design, high resale value, lightweight/optimized operating system, many available peripherals on the market, seamless integration with iTunes and other Apple software, great cameras.
Cons of an Apple device: Lacking expandable memory and/or replaceable battery, expensive, under-powered specs for the price, little support for third party hardware/software, little customization.