If Goku And Vegeta Were Never Rivals...

[Sovran Nila]

If Vegeta and Goku had not become rivals, would they have ascended to the same heights that they attained?

 

[Spiral-Force]

There's no doubt that Goku pushes Vegeta to get stronger, and the same can be said vice versa to some extent, such as Goku expressing his goal of surpassing Vegeta when preparing for Namek.

Training and competing in fights comes quite naturally to them, so if the alternate storyline demands it, won't put it past them to break limits as usual.

 

[Yoshi]

I think that Goku would still become strong, just not as strong as he is at the End Of Z. Vegeta would not be nearly as strong as he is today if not for Goku, however.

 

[GSM123]

Strong yes, because they have the desire to become the strongest and constantly improve. But as strong as they are today? I dunno. Depends on how their lives turn out in this scenario.

 

[Hector]

That's more suitable for the What If section.