Volleyball pools finish level constantly, far more often than football or basketball, because there are fewer matches and no draws. Three teams on two wins each in a pool of four is a normal Saturday, not an edge case, and the order you separate them in decides who plays in the quarter-final.
The standard hierarchy is match points first, then sets ratio, then points ratio, then head-to-head. What matters is less which one you pick and more that it was published before play started. A tiebreak announced after the results are in looks chosen to produce an outcome, even when it was not, and that is the version of the story that reaches the team that missed out.
Tournamyx recalculates the full standings — matches, sets and points — every time a result is saved, on the same public link the teams are already watching. Nobody is waiting on a whiteboard, and nobody is doing ratio arithmetic in their head between matches.