The main ones are:
Super Saiyan 1,2,3 & 4.
These are his solo transformations, but with Vegeta he can fusion to create Vegito and Gogeta.
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normal goku.
Depend on which version of Goku you're speaking of: Goku SSJ1 vs Majin Vegeta: Majin Vegeta Goku SSJ2 vs Majin Vegeta: Equal Goku SSJ3 vs Majin Vegeta: Goku Goku SSJ4 vs Majin Vegeta: Goku
Vegeta!!!
Goku was created in 1984.
Simple answer: Goku.