If I am understanding it right...you are asking me which desktop environment Zorin OS should use. I may have misunderstood your question so 🤷.
Personally, I consider Zorin OS a transitional OS for Windows users. When Windows users leave their old operating system, they are in a way 'leaving their comfort zone' and entering in the completely new world of Linux.
Linux newbies need stability and a good experience in Linux otherwise they wouldn't think twice and immediately switch back to Windows.
Gnome Desktop fits this description as it gives more stability and is also user-friendly. Other DEs that I know of can be quite overwhelming and would kill the purpose of Zorin OS. Therefore, I think Zorin OS should continue using gnome as their default DE.