I didn’t mention Windows because I don’t remember any serious workstations using it. PCs did become good enough but it still wasn’t the professional workstation level. Though if we’re talking about computing in general, Windows has been the king ever since 95 or even 3.0.
I worked in local government that used Unix workstations for GIS (Graphic Information Systems) - mapping of the local government’s property boundaries and many other layers. The DB was held on a DEC Alpha, and it was all very pricey, albeit very good at its job. ESRI ARCGIS, etc
When the time came to replace, they moved it all to Windows. The workstations were beefed-up PCs running NT4.0 and the DB was on a server with NT 4.0 server. DEC was gone by then, absorbed into Compaq, Alphas were discontinued, and no-one wanted to migrate to SUN or HP.