I don't know if anyone's brought this up yet, but when you think about it: Vegeta vs Shadow, Broly vs Hulk, and Vegito vs Gogeta mean that the Saiyans (I'm counting fusions as being individual Saiyans) have won three times.
In contrast, all three Goku vs Superman episodes (I'm going to count those since they have radically different information per episode), Vegeta vs Thor, Vegito vs Gogeta, and now Bardock vs Omni Man mean that the Saiyans have lost six times throughout the duration of Death Battle's existence.
Now if you want to say that Goku vs Superman only counts as one then you can do that, but it's pretty funny to think that a single race can net so many L's collectively throughout the years. It's comical.