thanks everyone. What's the best windows to use? I last used win 7. is everything 64 bit now or what?
Weak in what way? For my usage I can run MS Office, Visual Studio, Custom apps and there are no issue either with performance or application execution.VirtualBox is weak but Fusion and Parallels both work OK.
I used Fusion for years and it works well. Many years ago I started out using Parallels, and wasn't happy. But I suspects it's gotten much better over time.
I've tried both VMware and Parallels 13 on macOS Sierra, and I have to say, Parallels is the better app. Its easier to use and has a cleaner interface. Both Windows 7 and Ubuntu Linux are running fine on my MacBook.