The major differences:
1) The Mac build is 64bit so can handle larger sequences. That said, if you didn't have an issue on Windows, it likely won't make a difference.
2) The Mac version doesn't ship with ffmpeg to convert videos. You can get ffmpeg easily enough if you need it.
3) HiRes display support - this is the main difference. The Mac version does the standard "Retina" double size drawing stuff that every Mac app does. Thus, everything is the "normal" size, just sharper and clearer. On Windows HiDPI screens, things tend to get really really small. There are plusses and minuses. You can fit more rows on the screen with Windows HiDPI. However, many of the controls and dialogs don't layout right or are very tiny to hit on Windows HiDPI. Obviously, this only applies if you get a Retina Mac.
That really are the only major differences. There are some internal things like how fonts are rendered and having to disable the Mac AppNapp stuff when outputs are enabled, but those aren't things users see.