A server will always be the most stable although I have found AC will run well on any PC if you have enough RAM.
Windows 7 is reach EOL and will be a HIPAA violation on first day. We don't even use it, but I have a father in my practice who saw a computer running Win 7. Happens to audit for the hospital, and he pointed it out right away. So, a HIPAA fine could be around the corner, i.e. don't use Windows 7.
If you are going to use 8, then use 10. Eight is basically bye-bye. Just use the latest release. So far, it appears they just update them. I am hoping they don't come out with a whole new OS.
When Win 10 first came out, it was a nightmare. But, they changed it to make it more like 7, and it is actually very good.
So, either Windows Server 2019 Standard on a server computer or Windows 10.
