well then it seems you never bought the “right” windows systems and did get what you paid for…
that said a well built for audio system is still less than apple, far faster and newer.
as i said the imac is faster. its a 3770 Ivy Bridge fairly new but budget processor
the macpro is a much older processor like a 960
it takes a 6 core 3.33GHz 980 to match the 3700 in the imac.