Alright to help you answer your question, I Work with BOTH PC's and MACS:

Since more people own PC's there are more available softwere for PC's which results in BETTER software for PC's so if someone wished for the
FASTEST and most ADVANCED computer in the world he/she would get a PC 
The
MAC interface is alot more user friendly and in result more simple while in
PC's you can dig much deeper into the heart of the computer ex. regedit, DOS, etc.. to make the most advanced changes

Also, since there are a LOT more PC users, and the PC sytem is a bit more complex, there have been less viruses and maleware madefor MACS and the
SECURITY for MACS is BETTER
MACS generally cost more for the same specs as a P.C 
so overall, i would probably get a P.C they are jumt a bit more hardcore,
macs i recomend for the family's who don't know too much about computers and don't use it much because the security is better and it is easier to use,
PC's i recomend for poeople who want realy tough and fast computers and like to explore computers alot because you can build your own PC while you can't really build your own mac and when i say build i meen to use different parts. (Anyone can build a comouter if they know how)