Windows still has a long way to go before it is comparable to the Mac operating system.
What it really comes down to is that Mac is a more mature operating system. If you use only one program, you can get a handle on Windows. But the problem with Windows is the interface is not consistent. Applications usually are consistent to a point, but then they don't even use the same dialogue boxes. On the Mac you can build on what you know from one application to another.
The Mac may be more expensive, but it equalizes pretty fast. The basic advantage of the Mac is consistency. If you consider that your time is worth something, and it takes at least a few days to get up to speed on the PC, which is really cheaper? Of course, most price arguments get down to the fact that buying anything -- even if it's a PC rather than a Mac -- is better than nothing.