There's lots of versions of Stable Diffusion so I've had a hard time knowing what to compare exactly. But from what I've seen none of them come close to Midjourney.

Stable Diffusion does more things though, like in-painting where you can erase part of an image and then have it recreated. I've seen videos of people doing impressive things with in-painting and extensive regeneration of each portion of an image until it's just right. Seems like a ton of work though. Still I've had some fun using it to modify images or extend images.