You also get more options when saving to the library - such as the ability to include morphs or not, and to choose which parts of the figure to save if you want a partial pose for instance.

Pose dots are "all or nothing" - but they are very handy.

By the way, you can copy any pose that will work from the library - including advanced stuff that calls Python scripts and so on - to a pose dot for immediate availability. I seem to recall the dots are stored in different places according to your Poser version, so I won't attempt to give a step-by-step here.