What exactly separates a poor stone from a good stone? Theres a lot of stone brands out there and its quite intimidating to pick one especially when I dont really even know the difference between them. Id like to replace my current stone only because its too large and I move from place to place a lot so carrying a large stone can be quite tedious but i dont want to replace my current stone with a lower quality one. For example I know king stones are recommended for beginners while other stones like shapton glass stones are recommended for people with a bit more experience but what exactly is the difference?