my silly answer...
ehhhh
I don't know what a vey good pc is.
My serious answer...
A mac pro and a vey good pc can be almost the same in some ways, but a self build pc on pcpartpicker that is 2,000 would be better if you set everything right. I won't take the time to build 10 pcs and compare them right now, but a vey good pc would be better than a mac pro in the long run, at least that's what I think