Just to add to what's already been said...
The main thing about getting a laptop is the size and convenience of it. It's a lot easier to move around, and you can take it with you to classes if you need to.
I went with a desktop that I built myself, because I saved money and got a much more powerful machine, but I also do some video editing and gaming on it, which were the major factors in going for more power. If I didn't need it, I would have gotten a laptop. A little more expensive, but worth it.
Also... does your school have a wireless network? At my school, nearly all the buildings on campus are connected to the wireless network, so having a laptop with a wireless card was nice. that being said, however, my friends who had those laptops usually left them in their rooms, anyway.
Mainly it depends on what you expect to use it for.
Now, to address your actual question... (
) As for Apple vs. PC, I honestly don't think it matters that much. I like Apple notebooks better just because they look nicer. The same reason I like iPods as opposed to other mp3 players. But as far as functionality, battery life, longevity and all that, a new iBook and a new high quaility PC laptop should be nearly identical. Like Lasereth said, what you're more comfortable with is the most important factor. Your interest in "film and music" shouldn't influence what you buy: that Apples are better suited to them is just an elitist myth (having used both PCs and Apples most of my life, I can say that safely). And like Jimmy said, just keep in mind what software you want. The simple fact is that more software is available for the PC, but most of the stuff you'll probably NEED is available for both platforms.
Um. I think that's it.
Oh, and yeah, you'll want your own computer. While you CAN get along using just computer labs (and if you're easily addicted to games, maybe it's worth it =P ), it's mostly a pain in the ass. Just having a word processor and a printer in your room is enough to make it worth it.