JG> 1. Which of the two systems would you recommend, and why?

I would say Mystic. I've run both and found Mystic to be easier to run on the back-end.

 JG> 2. What are some of the unique differences that you like about the two
 JG> systems? 

The biggest thing for me is that mystic is all inclusive in a single config menu, whereas Syncro has sepperate config programs for setting up the networks and the echoes.

 JG> 3. Can the two systems coexist and run in parallel with the
 JG> same userbase (as showcased by at least a couple of active BBS'es)?

Don't think they can share databases. But you can run more than one at a time, just have to have them on different port numbers.
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Legends of Yesteryear (FIDO 1:123/256) - telnet: furmenservices.net:23322

--- Mystic BBS v1.12 A47 2021/09/29 (Windows/64)