There are now three different models of MacBook in Apple's line-up: MacBook Air, MacBook Pro and MacBook Pro with Retina display. Further still, each of those MacBooks is available in different sizes and configurations. It's not surprising, then, that many people have difficulty deciding between them. Here, we're helping you make that decision by examining the options and providing expert advice about which MacBook is best for you. First, let's take a look at what's on offer.