What determines tie breakers?

I've won most of the time breakers I've been involved in. But I don't really know why.

If by "tiebreaker" you mean - we each won a location and tied in the third location - then here is your answer:

The person who has a higher overall total point value is the winner.

Visually, this means that your winning location had a broader point difference than your losing location. E.g. you lost one location by 5, but you won the other location by 10.