Lots of pros use Macs with hardware TDM mixers. And ProTools running them. Does Logic’s TDM bridge still work?
That said, I found Cubase far more stable on OSX than Logic while running third party VIs. No more or less stable than Windows. The windowing is better on OSX by miles…but, to do heavy VI work, you need multiple internal drives, which means MacPro…which means thousands of dollars…and many of my VIs needed paid upgrades to be compatible with X.6, so I went Win7x64.
Doing light VI and general audio work, I really don’t think it matters. Take direct monitoring off the table as it doesn’t work for crap on any system I’ve had. Work? Yes…work well, no. So, you’re GOING to use the control panel of your interface to control its cue mix routing on either platform, IME…if you’re not just a picky bastid and use an analog mixer for cues like I do.