Vegeta doesn't have as many transformations as Goku, but that's simply because the Prince of All Saiyans doesn't need them.
Goku's had a lot of different forms from the original series, to DBZ, Dragon Ball GT, Dragon Ball Super, and most recently Dragon Ball DAIMA.
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10 best-written Dragon Ball arcs, ranked

Dragon Ball has crafted a compelling and complex narrative over the course of four decades, but some of its sagas have better ...