I have the Aergrind and Feld2, they’re both pretty good, especially the Aergrind as a travel grinder. I do feel the adjustment mechanism on the Aergrind is good for intended use, namely Aeropress and pour over. To me the Feld2 adjuster is possibly a bit overthought and although an ok grinder it’s perilously topple-prone.
I find my 1zpresso J-Max capable of much finer, easily repeatable adjustment for espresso..no surprise really as that’s it’s intended use, lol. Built like a brick outhouse, too.