Speed and aggression.

Since the Swiss system received quick negative feedback and no votes in its defense.

Please, the pros of the "Swiss" system:
1. The number of participants can be any.
2. The possibility to add participants after the start.
3. All players participate from the beginning to the end of the tournament (in my opinion, this is the main plus, because in "double elimination," interest and attention decrease towards the end of the tournament, and the ending becomes drawn out and few people are interested, as "Double Elimination Chamber" showed well).
4. Everyone earns "their" points, and in addition to the first rounds, a player meets with an opponent of approximately equal strength; the weakest players do not reach the top places but gain experience and the opportunity to compete with participants of their level.
5. The possibility to set a temporary result for an unfinished match without technical defeats and without delaying the next round.
6. Fewer rounds (6 instead of 10).