I have used both Shapton glass stones and Shapton pro's. The glass stones work well but wear very fast. They were supposed to be formulated for A2 steel but I do not see or feel any difference. I have used just about every sharpening method out there and have just settled on hollow grind (now I have a tormek, I used a hand crank or "Cordless" grinder for 20 years) and Shapton Pro 1K, 5K ,15K. I only use the 1K after a fresh grind to set the bevel and camber the blade. If a plane or a chisel is just loosing it's edge a bit (not dull) I just use the 5K and a few strops on the 15K. The Naniwa Chorsea are pretty close and I like the 400 Chorsea (Its a fast cutter but not too soft and doesn't deep scratches). I use it for nicks and such. I do not know all of the particle microns and such nonsense. I just know I get the best edge quickly with the Shapton Pro's. I use an Atoma plate to keep them flat.
For what it is worth
George
George Beck
Fishers Laser Carvers