What are the advantages and disadvantages of circulation system, elimination system and mixed system in volleyball?

The advantage of round robin system is that the competition can be fair and reasonable, avoiding the luck factor of drawing lots and grouping, and ranking can be arranged through points, just like all national leagues are round robin. The disadvantage is that the competition period is long and there are many competitions, which is not suitable for short periods.

The advantage of knockout is that the competition cycle is short and it is easy to produce champions. The disadvantage is that the result is accidental, and the lottery also has luck.

The mixed system is in between. Generally, Olympic volleyball matches will adopt mixed system, which has the advantages of shorter cycle than round robin system and more reasonable than elimination system.