I don’t think it’s anything you can’t change. By default, Ubuntu has some side bar dock thing. Vanilla Gnome has nothing except the minimal top bar. You open the application overview (press super) to access everything, the dock, all your windows, other desktops, search, etc. I have this as a hot (move mouse to top left) but use super a lot as well.
Other than that, it’s just fonts and icons and things. Some difference in default applications. But that side bar dock thing is the most obvious difference. Apparently Ubuntu has a bunch of Gnome extensions installed by default too.
Edit: There’s a comparison here: https://help.ubuntu.com/stable/ubuntu-help/gnome-on-ubuntu.html.en




Where I work they use the microsoft phishing simulation, for which they publish a list of domains they send from.