Why not get this going again? LOL the endless discussion.
Choose the PC if you have a significant PC software investment or you want it to be your gaming platform. Or you use software that is critical to your needs and is PC-only. Or if you are on a really tight budget and don't need much in terms of hardware and software. Apple doesn't even attempt to compete in the low budget low profit high volume computer market.
Choose a Mac otherwise. When you look at the life-cycle cost of a Mac, it's not all that different than a PC when you consider all of the hardware and software costs of both. The Mac OS is Unix based and is rock stable. I haven't had a virus on a Mac since 1991, and haven't purchased or installed any virus protection software since 1993 or so. Hardware quality is very high. I've had closed to 20 Macs between our personal ones since 1988 and the only failure I've ever had was a hard drive in the 1988 model after 5 years.
Also consider the cost of obsolescence. Regardless of which platform you buy, if you pay a little more up front for the better hardware, the machine will still be performing well for a longer time in terms of processing power, and graphics. My last 2002 Flat Panel iMac was still performing well after 7 years. By 2010, the more complex web page load times and the inability to run HQ video real time finally forced me to buy a new one - mostly because the grand kids complained about the websites they used that were "too slow grandpa". The 2003 G4 tower we have is still doing pretty well performance wise. So buying one machine rather than two over a period of 6 yrs or more is a significant savings. Mac HD and memory costs are the same as a PC-they use the same hardware, so upgrade costs are a wash.
I prefer the Mac because of it's quality, ease of use, virus-free operation, their great displays, and Apple's overall tightly integrated hardware-software environment. Both hardware platforms are remarkable machines.