We need to consider all the aspects here. This is IMPORTANT. FOR SCIENCE.
In terms of power potential, Saiyans are ballz ridiculous. The most powerful among them become destroy entire planets* or at the very least, defeat those who can**. At the same time, though, most Saiyans aren't Goku and Vegeta.
In terms of power potential though, Human/Saiyan hybrids outclass pure Saiyans. The human rate of growth combined with Saiyan's top tier power levels, create individuals who have the ability to become the powerful warriors in the universe. However, they lack the passion for battle and strength that pure saiyans have, so they lack motivation to achieve this level of strength.
*That bardock movie where bardock fucking destroys a planet
**Goku beats Freeza who blew up a planet