Why buy a MacBook Pro 15" instead of a MacBook Air?

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What is more important to you?

The Air uses a slower cpu but gives longer life when not plugged in. I'm not sure if that is a real dealbreaker if you're doing email, browsing, etc. Video rendering/Photoshop would take more time on the Air.

The Air also has a slower hard drive, so, if you're doing things that shuffle files, you'll be happier with the Pro. The Air also has a 120gb/128gb maximum drive size.

Larger screen, higher resolution, faster video card on the Pro.

Do you use a CD/DVD on your notebook? Air requires an external one.

If you need Firewire or built in Ethernet, you have only one choice. The Air uses a USB Ethernet adaptor. And, if you need more than one USB port, the Pro is the only choice.

The Air is a great machine to use for remote work when you have a primary machine. The Pro is a great machine to use as a primary machine.