Have both....use PC's primarily. When it comes down to price, unfortunately the MAC is too pricey. I wish they were more competitive in the market.

I use a PC, with XP.

Read comments about PC's running windows requiring to be reloaded, etc.
This is only true if your activities on the computer put you in circumstances requiring it.
I reload mine 'maybe' once a year, if it needs it. This time im going on about 2 years without problems.