Five words that get used loosely and mean specific things. Only one of them establishes that an address is genuine, and it is not the one people rely on.
The distinction that runs through all five
Reachability and authenticity are different questions. An address can be listed, current, fast and answering, and none of that says who is running it. Four of the five words below are about reachability. One is about authenticity.
20MirrorAnother door to the same building, not another market.Ordinary21v3 onionThe address is a key. That explains every attack on it.Ordinary22RotationAddresses being cycled. Routine, and never on a deadline.Ordinary23Signed rosterThe only thing in this book that establishes authenticity.Important24GoneAn address that stopped and started again has not recovered.Warning
What the list at the top isThis site publishes three addresses and does not monitor them. That is a statement about what is in use, not a statement about what is genuine, and the difference is the whole of this section.