Hi Andrew,
I'll echo what Erin and Kyle mentioned above. Between 10.6.1 and 10.7.1, we've added new functionality to Event Editor and improved product quality through bug fixes in Roads and Highways Desktop and Server. That's not to mention additional functionality and bug fixes made throughout ArcMap and ArcGIS Enterprise from all the other teams at Esri. If you can, go with 10.7.1.
Nathan
Esri Roads and Highways team