I’m thinking about creating an Blender add-on, which needs a pretty large and likely complex panel, with many settings and options. The add-on will not be likely specific to any one mode (e.g. edit or object mode). I seek advice about what would be a good place for this panel. According to https://wiki.blender.org/wiki/Reference/Release_Notes/2.80/Python_API/UI_DESIGN the location is free, but at least two alternatives exist: either a separate Side Bar Tab like the 3D Print Toolbox, or a tab in the Properties Panel:
Any thoughts? Is there any difference (besides location in UI) between using Side Bar Tab or Properties Panel?