FWIW, I was furious when Apple dropped PC support, so I can only imagine how it was for people who were also using eMagic hardware.
I kept Logic 5.5 for as long as I could run it, but eventually ended using Sonar exclusively.
There was more than just Logic to motivate me to finally move to Mac when I did. That being said, as a Mac user, I totally see the benefit of the tight integration. In fact, that's one of the things I used to appreciate about Cakewalk on the PC - they worked closely w/ Microsoft. Apple/Logic bring that to another level.
In a link posted by Backwood above, the OP mentions that Logic doesn't seem to outperform Live, which is at odds w/ my own experience, not just in terms of plug-in/track count (which obviously accounts for much) but in terms of user experience and transparent integration w/ the OS and hardware. That stuff really makes a difference, IMHO.
I can't imagine a PC version of Logic working 100% as well for that very simple reason. It has nothing to do w/ which is the better machine.