in addition to my previous reply, i would also like to say that it depends on what you will be using it for. if all you are going to do is type papers and write some email, then any pc laptop will do. but if you want to use it for more, then i would go with a mac ibook. if money isn't an issue, go with a mac titanium powerbook. if you are looking to get away cheap, then go with a pc.
i'm not sure what SeminoleRob meant by more power, but macs are far more powerful than pc's when it comes to speed, and workload capacity. mac's are simply better built so they can handle more at a faster rate.
as far as the game comment, more games are available for pc's, but almost all of them can be run on mac's even though they may say they are only compatable on pc's. but if you want the really good games, they require more computer which points to a mac.
bottom line: it depends what you're using it for.