ryanx27 said:For live electronic music (non-DJ, original work), I would go with the MBP, because the extra inch and a half or so of screen size and the higher resolution will free up that much more precious screen real estate. Working with Logic + multiple VSTs + whatever else you have going (like visualizations) often means swimming through a sea of windows, and is one of the reasons I'm dying to upgrade from my iBook G4 (besides the obvious issue of processor speed! ) Having a backlit keyboard would also come in handy in the live setting, unless you have lights for your workspace already. You have to know how to work those hotkeys and faders to rock out live, not just the push that mouse!
I was just gonna say this, I do very casual "DJing" sessions and I think the extra screen real estate on the MacBook Pro would be worth it, very worth it, not to mention having a bigger computer and a backlit keyboard makes things a little less cramped and more comfortable. When I use programs like MixVibes on the PC or DJ 1800 on the Mac I often find myself needing extra space, even on my 18/19 monitors, I can't imagine how cramped the 13" MB will feel.
Oh and its faster too you won't need much processor speed RAM will help loads, especially if he plans to run any Rosetta apps, I think 1GB is standard on every MBP so that shouldn't be a problem, if your friend has the money, I would recommend the MBP 17".
Summary of my post: Screen real estate is the key here, if the MacBook came in 15 or 17 inch configuration that would be just fine but 13" is too cramped for most serious DJ apps.