Processors:

Powerbooks are now capable of using the same Intel processors as other laptops, so processor speed isn't really an issue anymore.

Operating system:

This is probably the area with the most intense debates. The Mac OS X utilized in powerbooks uses a Unix platform to drive it's system. Many programmers believe that this gives the powerbook an edge as it is a superior system, since it can handle a large number of applications running at once.

Software:

It's true that much of the software being created is geared more towards PCs than powerbooks. In terms of productivity tools, powerbooks come with a complete set of software that is comparable to the typical Windows software. You can get web browsers, email tools and even antivirus software. However, if you plan on using Mac laptops for gaming, you may run into some problems. Many of the popular games just aren't compatible with the powerbook. Even the graphics software, for which Mac laptops were famous, are now compatible with PCs.

Customization:

This may just be the area where PCs win outright. Just take a look at Dell. While you can customize your powerbook, up to a point, it's nowhere near what companies like Dell and HP are offering.

Security:

Anyone would be a bit skeptical about an operating system which prompts you to download and install security updates to fix bugs on a regular basis. Windows isn't the most secure system, as evidenced by the tens of thousand of viruses that attack it. The powerbook does have a more secure system, but there are viruses out there that attack Mac laptops, just nowhere as many.

You only need to take a look at various company websites to know that powerbooks are more expensive than PCs. The powerbook operating system itself is cheaper so it may be an option if you're building a system yourself.

So what's the bottom line? Mac laptops ruled the roost, as it were, for many years. While the OS X operating system is still superior, PCs have come a long way in catching up. Unless you really have a strong preference, you might be better off getting a PC with a good antivirus program.