Generative AI isn’t useful without a good editor for humans to manually tweak and integrate the AI’s output, and Figma is essentially the only name in the game for that.
In what ways is it better? I've found Figma to be vastly superior, especially since they treat design like development, automating tedious processes like manually tweaking the layout and instead having a version of flexbox literally built into the design ("auto constraints"). They're bringing web dev and mobile dev ideas into design software.
My information might be out-of-date, because I gave up on Figma years ago, and I recalled Sketch being significantly more powerful as an actual design tool. But now I'm looking up differences and it seems Figma has improved in areas it was weak in previously, like not having color profiles. From their feature lists they seem about identical.