I feel like it wasn't a long time ago that we had this same thread, and Baldur dominated most responses there too.
In keeping tradition with my official Nintendo Fanboy Card™, though, I don't really care about God of War. Instead, then, my favorite boss fight of this generation was DJ Octavio from Splatoon 1... if that counts. Otherwise, I guess it'd be the *final boss* of Metroid: Samus Returns. And if that doesn't count either, and it has to be something NS/PS4/XBO, then I don't know, I guess the *final boss* of Hollow Knight.
No, I don't want to spoil people.