From my experience there isn't a clear difference in quality between the output produced by Dalle2 and Stable Diffusion. They both suffer from their own unique

From my experience there isn't a clear difference in quality between the output produced by Dalle2 and Stable Diffusion. They both suffer from their own unique idiosyncrasies, and the result is that they have differently shaped learning curves. I do admit that I rate the creativity of Dalle2 higher than that of SD. It can occasionally create really unexpected and exciting compositions, whereas SD will more often lean more conventional.