Dragon Ball GT still receives a lot of criticism, but there's a strong case to be made the Baby Saga is better than anything in Dragon Ball Super.
After Baby pushed ... the Great Ape form added tension to the sequence before he achieved a greater form, making the transformation feel more earned. Dragon Ball GT’s Super Saiyan 4 remains ...
As one would expect, the first character to unlock the Super Saiyan 4 transformation was Goku. After transforming into a Golden Great Ape, Goku lost his senses and let Baby Vegeta slip from his grasp.