You need both a simple drawing of your network with routers, switches, vlans, and uplink/downlink ports, like a roadmap for troubleshooting problems; you also need Excel spreadsheet of all devices in your network where you keep more detail.
Simple drawing of the network topology is crucial in network troubleshooting. The simplification also help with understanding data flow and easy to update. If we enter too much detail, it is harder to see, and to update. The outdate drawing is worse than no drawing at all. When your network down, an accurate, simple, easy understand network drawings is critical.
The spreadsheet is also important to keep many other vital information. For instance, you need an ip address for a new device, spreadsheet can provide that.