What are the differences? I noticed some capital ships have "Docking Ports" and some have "Docking *Bays*". I never really paid any attention to that til now.
Docking bays allow ships to be docked into your capitol ship, while docking ports allow you to transfer from one ship to another (tho, we can do that anyway)
To get from one ship to another in space, you'll require a docking port. Docking bays are the hangars on ships where smaller space ships are stored.
So, basically, at some time in the future, you'll need either a capship to pull that freighter of yours onboard or a ship with a docking port to walk on over.