Hi Graham,

IMHO if you are familiar with Cakewalk then I would stay with the Mac. The only thing the 32 bit Realband has over Cakewalk is that it can use native BiaB files. I think Cakewalk is a much better choice then RealBand. YMMV

Also remember that you can use the BiaB VSTi in Cakewalk and possibly Garage Band.

This is just my opinion. I am strictly a Window's user and I have little Mac experience. Hopefully Matt, who uses both PCs and Macs will shine in on this thread.
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64 bit Win 10 Pro, the latest BiaB and RB, Roland Octa-Capture audio interface, a ton of software and some hardware.