Difference between vmware and microsoft virtual pc.......?

This is mostly a matter of opinion on the user.

I use VMWare products at work and it has a nice polished look and operation to it, and very few issues.

I did try the Microsoft virtual PC 2004 version and the configuration was a little quirky at first, but in the end you get the same result. I have not seen or tried the newest 2007 version though.

You could try both, I know VMWare supports importing Microsoft Virtual PC drives into VMware products. So you could try one then the other with the same image.