Dragon Ball Daima marks the first time Vegeta achieves the Super Saiyan 3 transformation in the Dragon Ball series. This is one of the most significant developments to date, as it reveals that Vegeta has unlocked the Super Saiyan 3 form shortly after witnessing Goku utilize it during a battle.
Vegeta attaining Super Saiyan 3 instead of being overshadowed by Goku is a crucial aspect highlighted by future events observed in Dragon Ball Super, which gives Vegeta an edge over Goku in this transformation. Not only is he the first to use this form, but both characters are currently in a situation where Vegeta potentially has access to this form through regular training on Earth, rather than needing to go to another dimension to master it.

Vegeta can independently pursue Super Saiyan 3 on Earth
In Dragon Ball Daima Chapter 12, Vegeta reveals his own version of Super Saiyan 3, which is notably different from Goku’s. When Goku first used Super Saiyan 3 in the battle against Majin Buu, he had to struggle to reach this transformation during his training in another dimension. However, Vegeta’s situation is different; he doesn’t need to delve into another realm to unlock this new form.
After witnessing Goku use Super Saiyan 3, Vegeta realizes that he can also access this new transformation and has managed to do so through a secret training method developed in the months following the Majin Buu arc. Since Dragon Ball Daima takes place just a few months after the end of the last arc, Vegeta could have achieved this form rather quickly.

Vegeta may be stronger than Goku at this point
There’s an ongoing debate regarding the power levels of Goku and Vegeta in Dragon Ball Daima. We often see Goku engaged in long battles, which leads many to believe that he might surpass his limits and reach new heights. Goku has become accustomed to fighting at a level akin to that of his previous forms.
On the other hand, Vegeta’s recent battle against Tamagami demonstrates his first encounter with a formidable opponent of this caliber, and it is evident that significant adjustments must be made. It is plausible to argue that Vegeta has to transition to Super Saiyan 3 to counter the overwhelming strength bestowed upon Tamagami. Yet, this also presents a different challenge for Vegeta compared to Goku. He does not need to engage in a battle against a Tamagami powered to a higher level of strength; he simply needs to reach Super Saiyan 2 to secure victory.
This development offers Vegeta an advantage in the ongoing competition against Goku. Although Goku may access Super Saiyan 3 independently, he has lost many years in different realms. It can be argued that Vegeta’s exposure to Goku’s Super Saiyan 3 form has provided him with substantial insight into achieving that level of power, yet it still remains a challenge.
Vegeta has seen this transformation and can potentially attain this level of power in just a few months. Regardless of the circumstances, it remains a method through which Vegeta can surpass the limits he has set for himself. Vegeta rarely experiences the thrill of victory over Goku, which is why Dragon Ball Daima has begun to address this imbalance, even if just slightly.