Post is old and some things have changed. Mac is more consistent and performs well, but I have found with a well rounded PC that it still slightly outperforms mac.
I am currently using a laptop with no extra programming dedicated to music, it has a new gen I5 with 12gb ram and a tb ssd, I use Foobar 2000 (used it for years and know it inside and out). I've had a few Mac's on my system, but my well spec'd PC machines are where I'll stay unless other things develop. I've not tried roon