yep, they use the same processors and board architectures now and their operating systems whilst different are just flavors of unix, so no nett benefit moving from one side to the other
main difference is and remains that macs are 60% optimized out of the box to produce audio, pcs are maybe 20%. Moving your mac to 90% optimization or better takes a lot of hard work whereas tweaking your pc os to 90%+ is relatively easy, including being able to access legitimate iso images that a pre-tweaked for specific interfaces and daws
vst was created for all platforms that support them (i.e. they are specific to daws not os's, although you do need versions compiled to run on macs - most vst makers will do that automatically) whereas au was created for mac based daw software such as logic