As a Mac user, I have a bias toward it. A little shopping around will
show that the prices for a high end machine, which is needed for
graphics are not that different between PC and Mac. I have used Macs
for 8 years now, and can do most of the service work myself (which is
a big plus).
I did see a great deal of PC software at the last Siggraph
But...I guess your husband might want to contact his future employers
and find out what they recommend.
Hope this helps a little.