MRK,
the Atomas cut noticeably better on the most challenging to sharpen steels such as 10V, S110V, or M390.
The Congress Tool Moldmaster stones cut far better than the stones supplied by Edge Pro.
The very coarsest stones of most any brand tend to wear fast.
chefknivestogo has a house brand similar to Atoma that is lower price and works well, so that is another option.
Different stones work best for different steels.
I use the Moldmaster stones as the default, and the Atomas for the harder to sharpen knives.
