Are you buying it for the brand or you can't live without a notebook and are interested because it is a durable notebook? (Though a fairly overpriced one)

What purpose will it serve?

All right Minty, April Fools is done now.

Is he a die-hard linux fan? If so then I get the joke. :p So many trolls nowadays...

definitely the pro, assuming you will be using this for making music (what else?)

the extra processing power will serve you well, and even the lower end spec model is suffice. also the reported heating issues of the air could cause a problem if you plan on recording instruments live, and/or running a bunch of synths and stuff at the same time. its woth noting that you still might experience some input lag, but far less so that an equivalent set up using windows.
the biggest downside is the glossy screen, might sound irrelevant but when your trying to rock out with your guitar its useful to be able to glance at the screen and see whats going on, so reflection issues might be something to consider.

all in all though i would say the pro looks like a really good (but not necessarily affordable) portable studio, granted you have cubase and a few decent vsts in tow

bye bye minty, was fun knowing you mate

Cya across the Styx with Steve Jobs, Gaddafi, and Satan mate.

lol gaddafi, the new poster boy for apple

Burn the heathen! BURN HIM!!!!!

No seriously, burn him, he's not only gone to the dark side, but will now only wear black polo jumpers and look like a muppet...

There's an app for that.