In the end it's up to you but..
Protection and safety - Mac is better. It's less prone to viruses. There simply aren't that many Mac viruses around, but any good anti-virus program will protect a Windows machine. I've been using various computers for a long time and only ever had two viruses on a Windows machine. One was this http://www.youtube.com/watch?v=xelN2qBzvzQ in the late 80's or early 90's and the other was because one of my nephews turned off the antivirus protection then downloaded some crap from a P2P network.
Range of programs - Windows
Upgradability - Windows
Looks Good - Mac
System stability - about the same. Don't get carried away with the thought that Macs are crashproof, they are not. Older versions of Windows used crash, mostly due to memory problems, but it's rare for XP or anything newer to crash.
Capabilites - about the same. Windows and Macs use more or less the same hardware. Some people still insist that Macs are better for multimedia work but they are living in the past. Macs used to be built with fast (for the time) SCSI drives and a Motorola RISC processor especially designed for multimedia work. Motorola just couldn't keep up with Intel and so Apple started using their chips about 10 years ago.
Games- If you're a serious gamer then you need Windows
This argument has been going on for nearly 30 years (along with the Linux thing) and the only reason it's still continuing is because there is no clear cut answer. Just go with the one you want and get the best you can afford.