I used to only use PC's, but converted to MAC bout 2 years ago, an i wouldnt go back. However thats not to say there's anything wrong with PC's, i just prefer MAC's to me there more effecient & simpler.

The main pro's for me are:

no virus's
you can use logic 7
they never crash (my mac has never crashed in 2 years)
os x is wicked
its not made my microsoft

just use what you prefer though