I agree that depends on your application, if only for homeworks (e.g. MS office), PC still the best choice, although Office has Mac version, the interface is a bit different when using.
But for others, photos and movie clips editing, music editing, definitely Mac is the something PC cannot perform. Maybe a good choice if you want your children to explore this part in future.
That's my reason why I changed to Mac 2 yrs ago. Hope this help!