There are numerous advantages to Pro, listed at the Smith Micro site in great detail. Here are what I see as the core advantages...

• Graphics card render acceleration (but needs a very fast NVIDIA CUDA-powered card).
• Collada and FBX import/export.
• Use HDRi to light your scenes.
• 'Render in background', and much improved 64-bit rendering.
• Save renders as .PSD Photoshop files, with multipass render passes as layers inside the file.
• Network rendering with the render Queue Manager.
• PoserFusion plugins (render your scene in Lightwave, 3DS Max, Maya and Cinema 4D). (Though Vue is the best option there, because it knows how to handle the Poser materials).
• A more cost-effective upgrade path to Poser 12.

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Learn the Secrets of Poser 11 and Line-art Filters.