I like the eras multiple thousands of years BBY because it's less known. I actually had someone deride me for wanting to do something in 100,000 BBY because they thought nothing exciting could happen. I would have agreed if it wasn't for the fact Coruscant, Korriban (and by extension the Sith), the Muurshantre Extinction, and the Dathomir temples were getting their start around that time. I think that's fascinating to think about the Sith species really getting off of the ground and Coruscant being newly made!