Solar system: World Partition or Streamed levels? Or both of them?

Hello there!

I need your advise about the large worlds, like a solar system or even bigger.

Let’s say, I have a star and couple of planets (spherical worlds).
What is the best way to organize this system with possibility to travel between them?
To have each planet as individual map?

Should I use an existing solutions like WorldScape Plugin?

Thank you in advance for your suggestions!