Bronze tier subscribers get access to images rendered with a real-time, physically based rendering (PBR) render engine (currently Blender's EEVEE). That is the render engine I use in my 3D workshop.

Silver, Gold and Platinum tier subscribers get all imagery subscribers to the respective Bronze tier get and on top access to images rendered with a path-tracing render engine (currently Blender's Cycles). That is the render engine I e.g. use for the final renders for the production of the animated storyboard clips you may have seen.