Hi ImanoI,
Apologies for the late reply. I was out on business travel last week.
> If we take the ArcGIS Enterprise License, does this ArcGIS Platform/ Esri Road For Utilities it's still the best solution for water, sewer, and storm editing using PostgreSQL?
You will also need to have a copy of ArcGIS Desktop (e.g., ArcMap) to work with utility network data. As far as I know, currently you should use ArcGIS Desktop 10.2.2 - as it is the optimum release to work with utility networks.
If you want to work with utility networks and the Web, then yes, you would need to ArcGIS Enterprise to enable the utility network data as web services.
Also please note, there is a new utility network model coming out soon that works with ArcGIS Pro. Please learn more here, Esri Utility Network Pro
FYI, for future questions, I suggest you post in this forum, Utilities and Communications
Hope this helps,