Hi Donald,
I've used both for years, and we have inspectors running our software on both. I refused to use Macs for over a decade. I worked for schools, law firms and other companies consulting and built over 500 computers over the years. I could always build a PC for 1/4 the cost of a Mac, so I could never justify the cost. But as of a few years ago Apple started using the same hardware for Mac as PC's use. So internally there is NO difference.
Now, one of the thing Mac lovers like is the fact that there are no Viruses. There are a few, but it's true that there is 1/1000 of the number of Viruses for Mac as there are for the Windows. This is not necessarily because Mac is better, it's because Mac has a 5% market share and people who want Viruses want to infect as many computers as possible so they target Windows.
Other users like Macs simplicity. Apple does keep a very tight leash on software developers and hardware developers. Everything has to go through them for the most part so they can make sure it works well without extra drivers and other issues that plagues Windows users.
Bottom line. In today's market, they are both good machines. You can get a faster Windows based machine for slightly less than a Mac, but it's so close now that it doesn't really come into play any more. So in the end, it's really up to you as to what you want to use! Just make sure your favorite program runs on a Mac!
