The "best" tournament flow depends on how many people participate. Round Robin can be lengthy if a lot of people but is ideal for when something like 4 people play. Double elimination could work for a low-ish turn out with too many to RR. Ideally, if enough people of play you play X rounds of swiss cut to top for single elimination.
Best of 3 if pairing is easy, though trying to reliably pair with no real pairing system can be a pain in the ass.
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