I don't find my Thuringer hones to be better than my Coticule tbh; though they are consistent
I was also stubborn and didn't feel like using synthetics, but I'm glad that I did. Taking out of the equation the entire slurry thing and unicots and dilucots made my life endlessly easier.
It was always a hit or a miss, ergo I wanted consistency and went to synthetics, and only use my Coticules for pure finishing nowadays, muuuuch easier.
I also severely doubt that my inherited Coticule was ever used with slurry, I don't think it has been, and was purely used as a finishing stone.
Even-though they're capable of everything from bevel setting to finishing, it's too much hassle and too inconsistent in my hands.
Although my best ever shaving edge came from a Dilucot on a BBW (La Nouvelle Veine) Go figure. Although very hard to replicate the results.
Next shave is gonna bea Coticule edge done on oil and a BBW edge done on oil