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The Volumetric Geometry mode tends to be slower to render.The Volumetric Geometry mode does not work with Probabilistic Volumetrics.you use an Aerial Perspective and a Volume Grid Simulation - if the mode is set to Volumetric, one would be entirely behind the other in the rendered image. Blending of multiple atmospheric effects in the scene - e.g.Generation of Render Elements for compositing - for a complete list of the supported Render Elements in both Volumetric and Volumetric Geometry mode, please check the Render Elements page.
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The Volumetric Geometry mode is provided as an option for the following reasons: Volumetric vs Volumetric Geometry mode when rendering on the CPU This page provides some useful tips for rendering volumetric effects.
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