My own Windows10 transition is definitely not for my main work, as W10 is bothersome to navigate, for example word dictionaries are scant in W10 . My main use is rather to explore very specific new tools in Rhino7, (as their Mac side is less supported in the plugins and in the Youtube training of very specific work tasks). Rhino's Youtube support vids are amazingly extensive, covering many instant-solutions, as done by users at no cost to viewers. Specialized tool solutions are demoed quickly, which I prefer to the long showcase videos or long courses-A-Z. Keyword searches make this fast.
The basic geometry stuff is the same and Rhino gives me more depth to explore, as for example the deform tools for complex objects are much faster and easier than formZ, (RE Bend and Taper).
My 2012MacPro is about equally fast for my W10 installation of formZ. Common shortcut-hand-patterns for formZ and for Rhino, in both Mac and in W10 might be possible, by "re-mapping" the Alt- and Command- keys, when adjusting sct files in W10, and I don't plan on using other W10 apps with many shortcuts.
I expect the new MacPros might eventually become affordable, but the old ones are good enough for me on OSX 10.13.6. Chances are future upgrades of everything will be subscription only, so older will be better for me working offline.