Should I buy a mac or a pc laptop?

If you're asking this question without any preference whatsoever (you don't have specific love/hate relationship with either Macs or Windows), I would advise you try out a Mac first. Head over to an Apple store, and play around with the machines there. See if it's a right fit for you.

You may also want to specify what sort of things you'll need to be doing with your laptop, so we can get a better idea if a Mac would be right for you or not.

Just to throw in my 2 cents... and pretty much go along with everyone else. There really isn't a reason not to go with the MacBook. As it sounds like you're new to the idea of a Mac... terms like "BootCamp" and "Parallels" may not be familiar to you. Unlike the days before Apple moved over to Intel processors in their machines, you can now run Windows natively on all current Macs. A free utility from Apple, called BootCamp is basically a boot loader/manager (along with a driver package for Windows). Here is more info on BootCamp:

http://www.apple.com/macosx/bootcamp/

Basically, when booting into Windows with BootCamp, your MacBook IS a PC. It's not running under any sort of emulation. It will perform exactly as if it were any other high-end PC notebook.

There is also a program called Parallels. Parallels lets you run Windows within OS X (the Mac OS). The performance of Windows when using Parallels isn't as good as it is when using BootCamp as you are running OS X and Windows at the same time and sharing resources. Having said that, the performance is perfectly acceptable for just about everything except more graphically intensive applications. The graphics processor in the MacBook isn't all that powerful to start with. Here is more info on Parallels:

http://www.apple.com/getamac/windows.html

http://www.parallels.com/en/products/desktop/

The best option is to install Windows using BootCamp. The drawback to using BootCamp is that you have to exit out of OS X to restart your machine and boot into Windows. If you decide you want to go with Parallels, the latest version of Parallels lets you use your BootCamp installation to launch Windows from within OS X (and you can still launch Windows using BootCamp if you wish).

If you plan to use Parallels, I would suggest having at least 2GB of memory in your machine. If you're just going to use BootCamp, 1GB should be fine.

And
never , ever turn your back on it when you are using
it out in public. invest in securtiy stuff. Take it
to the restroom when the time comes. They are very
attractive to others, more so than a pc laptop.

And even if you have to, you should use something like iAlertU ( http://www.slappingturtle.com/home/), which sounds an alarm if the laptop is picked up or used at all while you're at the counter ordering your mocha or whatever. It works great.