The way I see it is only get a macbook if you MUST use apple requiring software and applications. Not a knock on apple at all, it's very high quality. Their software and components comes directly from apple, therefore it's naturally easier, convient, less hasseling, and applecare from what I hear is excellent. But theoretically, a naked macbook is a pc so as a result, you can get more powerful hardware specifics at the same or even cheaper price going with a pc. However mac's video card isn't designed for major gaming unfortunatly, and I doubt you can upgrade the video card as I think it's connected to the motherboard in the laptop. If you get a macbook pro, get the best video card available.
So you wish to do gaming and work a DAW (digital audio workstation)? Not to discourage you but you can build a more powerful but also much cheaper desktop than going this route, but I'll help. You will need a good memory card (I recommend 512mb of video memory), good RAM (I recommend 4GB, possibly with the possiblity of expanding up to 8GB), and lots hard drive disk space. Depending on how serious you go with home recording, you might need to get a couple hundred GB capacity and a hard drive with speeds of 7200RPM, but its easy to upgrade a hard drive disk space so you might just go with the standard for now.
My advice to you is somehow expierence OSX and Logic or other DAW software to determine which route to go. Don't buy a computer then search for DAW software you want. There are other great DAW software such as cubase, sonar, pro tools and etc and they all are about the same, there's no "best". What's most important in picking DAW software is what you find most comfortable. You can try a friend's mac, look at youtube tours, or go to a music shops that sells DAW software to get a tour and feel on that. If you find that Logic software (which is great) is the one you're most comfortable with and you're comfortable with OSX, then get the macbook pro. Also, the macbook can have windows software as well using bootcamp or applications such as parallel which allows you to use mac and windows applications simutaneously. It might help with games. Very useful, but may not be pratical.
I hoped I helped. Message me if you need more help. Good luck!