I keep waffling back and forth whenever I think about booking up my explorers. Of course there's also the option of just spending the last book lower in the tree. Does anyone have any suggestions, considerations, or convincing arguments on picking one or the other?
I also have a couple of questions about the rarity search. These two sites give completely contradictory information:
https://en.tsomaps.com/handbook/explorers
http://settlersonlinewiki.eu/en/guides/explorer/
The *.eu wiki seems to indicate that the primary finds are only iron ore or coal, and only about 40% of the time do you find beans or guild coins.
TSOmaps indicates that the primary finds are higher end resources like granite, saltpeter and titanium bars, but has no indication of the frequency for finding beans or guild coins. Does anyone know which one is closer to being correct and what actually happens when you send out a rarity search?