I'm not sure what the Mac version of SignCut looks like, but I can tell you that the windows version looks very similar to VM.
I run a Mac with Parallels - so much easier to cut that way, than to do native and re-learn software that is Mac compatible. Others will definitely say differently, but I guess it comes down to how much time and willingness you have to learn a new software, and how often you're in the Parallels environment. I was in it all the time, so it was a very seamless thing for me.
The only cutting software I now have for the Mac environment is from Graphtec, and I can tell you that the Mac version is so much more limiting than the Windows version.