Joe is thinking of getting either the 13" MacBook Air or the 13" MacBook Pro. He also wants to get an external drive. The 13" MacBook Air has far better battery life, but the MacBook Pro has a much better retina display. So it really comes down to what he wants most. The MacBook Pro also comes with a 256 GB SSD. Leo says he should only use an external hard drive if he finds he's running out of space on the laptop. It's best to keep what he can on the internal drive, so he doesn't need to always rely on having an external drive plugged in.