Every stat effects every attack differently, anyone who wants to understand the mechanics of this game should test each hero to see how the stats effect them.
That being said, Crit is the most consistent stat there is, and seems to have less hidden quality's than the others.
The effect of break has a direct relationship to the block of the opponent(and vise versa). It is important to keep this in mind when testing as it can skew results and lead you to conclusions that are incorrect if you do not.