Both Mac and PC have their advantages and disadvantages. It's good to see each specialises in their own field. At the moment, if your a gamer you'd find it a bit more difficult if you didn't have Windows. I think Apple's move to allow Windows to be installed on the Macs was a pretty good move. Now, as many have stated, you can get the best of both worlds. Mac OSX is easier to use but can also limit users. Windows is a more cluttered in the sense of the start menu, file system etc but you can access basically everything. It depends on what you want.
I am hoping to buy an Intel Mac because I really like the iLife suite. I use Adobe Premiere Pro for editing my short films but if I'm doing a family video for instance, I want to do it quickly. iMovie is good for this, whereas MS's movie maker is very poor. Apple is better known for it's software and hardware quality. They basically make top of the range stuff. Since microsoft doesn't make it's own PCs, it's probably got a lot of hardware clashes with windows.
But... because windows 95 owned apple, it's kinda been Windows all the way. Apple had to start again and have probably only been decent since OSX came out. It will be interesting to see what happens when Vista comes out.
Anyway... overall, I reckon Apple is based on quality whilst MS is based on getting money and distributing their product. Didn't the XBOX have heat problems? It was released too early, to beat PS2. And now microsoft is trying to equal apple and enter things like photo editing and animation etc. Honestly, they are going to need to improve their operating system and work on things that matter before they expand.