Smooth render is smooth. I really love to see this kind of fractals (a fractal that has a negative space) rendered nicely without a dirty jaggy and grain.
The gradient is also nice. a little touch of green on the spiral really attract me the most. pink with some touch of yellow is also one of my favourite color combination. the gradient you use here is really really nice. i love it so much.
on the technical sied, the pre-blured variation is really works well because the render is really nice. my suggestion (if you want to tweak this), you can try to use a lower value of pre-blur to create some texture. or maybe you can also try to use radial blur to create some paintery effect.