I told Tom that once I got my Plasma laptop rebuilt, I'd re-create my VMs, including Zorin Core, and let him know what I thought of it as a Windows alternative. Thats done now, and as you can see, Zorin is a very lean distro.
Above are the listings of my VMs in the VirtualBox Virtual Media Manager. I was surprised that Plasma wasn't the smallest, as it was the last time I did this exercise, but I now believe that was some kind of a fluke. It makes sense to me that all the Solus DEs are similar in size. Also of note: the Zorin VM is about 1/2 the size of the Windows 10 VM. That would be a strong vote for Zorin vs. Windows, especially on marginal equipment.
I have a standard configuration for the VMs that I create: install the OS, add my BashrcAdditions (macros) to the terminal, and install the micro editor, Vivaldi, and nfs-utils. Then I modify /etc/fstab to include my NAS shares, add LastPass to Vivaldi, and complete its settings to my satisfaction. That's what I consider an initial configuration to make the VM into a useful computer, and it's how all of the Solus VMs above started out.
Overall, I was very impressed with Zorin Core. It shows careful attention to creating a pleasant and smooth user experience. I think ex-Windows users could adapt to it as easily as they could adopt any Linux distro. I feel pretty much the same about Solus Budgie. Either one would be an excellent introduction to the Linux culture.
So yes, Tom. in my opinion, Zorin would be a good choice for casual Windows users. I should point out, however, that even I would need some training in order to become comfortable with it. I wasn't able to set it up like the Solus VMs despite spending more than an hour trying to.
I tried to locate or install Micro, the best CLI editor, as I intended to add my NAS shares to /etc/fstab. I finally settled for Nano, for lack of anything better. Then I found out that Nano apparently supports cut/copy/paste only within Nano. It was unable to paste the fstab additions I'd copied from the file manager's view. But in the end, that didn't matter much, because it appears that there's no /etc/fstab in Zorin. I also couldn't find any way to install Vivaldi, so I couldn't configure that. And I found no evidence that Zorin supports multiple workspaces, although even Windows does.
None of these perceived drawbacks might matter to a casual Windows user, but I wanted to do my best to configure Zorin like one of my Solus VMs, for comparison. It might have been possible with some additional research, but I didn't have more time to spend on it. I'll revisit the Zorin VM soon. There is a lot to like about Zorin, and I look forward to learning more about it.