Correct, the comparisons are on a PC and I'm pretty comfortable saying JRMC17 is the best option for PC.
I don't have a MAC. I've read a lot of good things about pure music (and other players on MAC), but haven't tried them. One day I'll get a MAC alongside to compare. If pure music was available for PC I would definitely give it a go plugged into itunes, because the itunes organisational stuff & interface is marginally better than JRMC17, but the sound isn't as good on PC. I actually keep itunes around to do most of the organisational stuff (but mp3tag for artwork).
Typing this I just realised that I use 4 different programs to listen to and manage my music, bugger. I guess it makes sense, we can't expect any one company/player to be the best at everything.