>>>I am looking at a mailer from Dell where most of the computers show the following spec: "Windows 7 Professional with Windows 10 Pro License".
>>>
>>>Does it mean that the computer would come with Window 7 or Window 10 installed?
>>>
>>>TIA
>>
>>In my recent experience, 7 is installed, with media included for 10.
>
>This is good. So the Windows 10 is an option, which I probably won't exercise. Thank you.

10 is fine, just take the time during install to turn off all the tracking crap you can find. Then install Classic Shell. It's a decent experience IMO, I haven't found anything yet it has broken, application wise.