A summarized feature comparison is the first place to understand the differences.

It is here: http://poser.smithmicro.com/comparison.html

Each person will find some things worth more or less than others. And, you may or may not have the hardware and OS assets needed to take full advantage. So as always, your mileage may vary.

The key things that generally get interest are background rendering (you can keep editing while rendering), 64-bit support (bigger scenes, more stuff in one render), and gamma correction. For those with multiple computers, network rendering is a big deal - 3 computers? Triple the rendering speed.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)