Unfortunately, we can not advise you on whether to choose Windows 7 or Windows 10.
From what I know, in January 2020, Windows 7 end of life support comes in place. This means that users won’t receive any updates from Microsoft, and companies have to pay extra for the next three years if they want them.
Now, to be honest with you, it all depends on whether you are more familiar with Windows 7 or Windows 10.