VirtualBox is an adequate VM program. It runs Windows and Linux reasonably well. But I’m not using it on my Mac because I can’t double-click on a .docx file in OS X and have it open in Word on Windows in a VM. Both VMware Fusion and Parallels can do this.
Yeah, I could install Office 2016 for Mac. No, it doesn’t run all of my Word and Excel VBA code, and I have a lot of complex VBA code. (It will run some, but not all VBA.)