These stones, though from the same maker, are very different in every way.
The Super stones (we can call them that to keep it easy) are soft resin bonded stones so they will wear quickly. They are loved by razor honers because they produce a very smooth an polished edge plus they have grits as high as 12k. While this is good for razors I find them to smooth out the edge of EDC blades waaaay too much which causes the blade to slip over materials instead of bite into them. Also, from about 1000 grit and under they wear so quickly it's almost not even worth the purchase. IMO, good for razors but probably my very last choice for anything else.
The Chosera stones are very different, they are a magnesium bonded stones and much much harder. I don't know if they are that much faster but they keep cutting because the surface does NOT load like the Superstones. The higher density/hardness of the stones makes them very slow wearing and allows for cleaner and more crisp bevel lines. Despite their higher hardness they have very good feedback and tactile feel and are considered some very f the most enjoyable waterstones to use.
Though you can produce a polished edge with the Chosera stones they do not produce the glossy polish of the Superstones. It's more of a destinct and consistent scratch pattern that IMO is unmatched by any other stone. The clarity of the scratch is simply amazing and makes transitioning from stone to stone very easy because they cleanly and completely remove the previous grind marks. I believe it's their high level of grit uniformity that makes them like this.
The standard recommendation from Naniwa is to use the 400, 800, and 3000 grit stones. This is the ideal set for most sharpening needs and the 3k produces a near perfect edge that balances both refinement and tootyhness very well. The 5k and 10k stones are for specialty sharpening tasks, the 5k for sushi knives and the 10k is for swords.
The only change I would recommend is to use the 400, 1000, and 3000. The 800 grit stone works great but I find it to be a bit dead in its feel, i just never liked it.
FYI, these stones will do best on average stainless steels and carbon steels. They will work ok on some PM steels but I would not recommend it.
