Does anyone know which one of these is the fastest single threaded wise?
That would be a good balance for a workstation, no?
The 7700k beat out even the 6950x in terms of single threaded performance, due to higher clock (and higher overclockabiltiy) and is current king of single thread performance.
However, if you aim for Rendering primarily, there is no reason to compromise on Multi-threaded performance, to gain single Threaded performance.
As such, in the mid tear price range Ryzen currently hold the lead for workstations in all 3D related fields.