Well, I think for tournaments there need to be more than just win/lose score to get a tiebreaker. It need a MoV (Marge of Victory) to be able to break tie. In X-Wing, it is squad point destroyed. This also allow to set a timer and have game end due to time without being a simple draw.
In Codex, it would be base hp.
In Yomi, it would be character hp.
Basically, you add or substract (depending if you won or lost) the difference between both opponent to the max value.
Codex example: P1 base has 3 hp left, P2 base has 7 hp left when game end due to time, giving a difference of 4. Base hp max value is 20. So P1 has a MoV of 16 and P2 has a MoV of 24.