Akira Toriyama’s Dragon Ball has worked hard for nearly 40 years to be one of anime’s biggest success stories and an evergreen shonen hit. Dragon Ball has evolved in bold ways over these four decades, but regardless of their differences, each series in the grander action franchise chronicles Goku’s heroic efforts to protect the universe from dark forces. Goku and his friends have a tremendous capacity for power, but many of their greatest triumphs are the result of incredible transformations that push their strength to unprecedented heights. Super Saiyan transformations have been a Dragon Ball staple ever since Goku’s climactic clash with Frieza and there’s been no turning back in this powerful department.
Source：https://www.cbr.com/why-ultra-instinct-goku-is-stronger-than-super-saiyan-4/
