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Review of Renderman powered by the Slant community.
Renderman is a proprietary rendering software developed by Pixar, originally for rendering its in-house movies and now available as a commercial product.
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Pros
Pro Production proven
Pro Support for Blender
See here.
Pro XPU CPU/GPU hybrid renderer
New in version 24. Very fast but not yet feature complete.
Pro Highly flexible
Pro Hollywood standard since the 1990's
Hugely versatile as for every shader can be written in code thus it is extremely fast and complex.
Pro Physically based rendering
RIS and XPU.
Pro Wide feature set
Pro Real-time rendering support
Using interactive rendering RIS/XPU.
Reyes was removed in version 21.
Cons
Con Very steep learning curve
Users must have a complete understanding of C++ programming to make their own materials.