Pardon my ignorance, but what is the real difference between the two? I tried searching both the online manuals and forums. The manual section lacks this information and the forum search function doesn't work as I anticipate.
I have a high geometry grouped object that when I use the Viewport rendering function, I am pausing then rotating the group to obtain different views. The viewport doesn't update to reflect the turned group after pausing and unpausing.
I'll often either have to hit the "Update Render Geometry" button or "Rebuild Scene" but they both seem to do the same thing.
The better solution would be for the rendering engine to recognize that something has been turned/moved even if something is paused/unpaused.