Actually goku is not far stronger than Vegeta. In battle of Gods Vegeta became stronger than goku when lord beerus hit bulma.
Whis in the new movie from what I have read says that both are incredibly strong but both have major weaknesses. But when they work together they are unstoppable.
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I know but im talking about the time period of vegeta and nappa when they blew up the planet of the roach people
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But I do get what you are saying, I'm a Vegeta fan :-)
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At that point Vegeta was much stronger than goku. Goku used the kaioken to boost his power level to beat Vegeta.