Either can give incredible edges. JNATs are fun for me because I have to learn a stone's "personality" before I can really max it out etc. The feedback on some JNATs is just crazy; you say to yourself "no way am I rubbing steel on stone", but you are. Some feedback I have encountered seem really elastic, others velvet soft, others hard and unforgiving, still others with almost a synth like feel. All of that depends on the slurry used etc too. Far from an expert, but none of my JNATs, perform and feel the same. Not shocking since they are natural stones I guess. But differences can be profound. Expect to pony up dollars if you want a big museum-type piece that will finish a razor. Koppas or small ones are reasonable. Purchase from a seller that knows razors.
My lone ark is an old trans ark, very hard but pretty easy to use and doesn't mind pressure, circles, half strokes, stropping strokes, you name it. It is not for polishing turds, however. Present it with a poor edge and it wont make it better.
My lone ark is an old trans ark, very hard but pretty easy to use and doesn't mind pressure, circles, half strokes, stropping strokes, you name it. It is not for polishing turds, however. Present it with a poor edge and it wont make it better.