Midjourney is still going to be hard to beat imo. Comparing SD to MJ is a little unfair considering their applications and flexibility, but I do really enjoy the "out of the box" experience that comes with MJ.
I can run SDXL 1.0 offline from my home. I can’t do this with Midjourney.
A closed source model that doesn’t have the limitation of running on consumer level GPUs will have certain advantages.
So speed can vary wildly depending on how you're choosing to use it. And that's without even getting into the wide variance of hardware.
But generally speaking, it will usually be significantly faster than one image per minute.
StableDiffusion needs you to be way more specific than Midjourney. MJ will fill in the gaps of your prompt to get a better image. SD usually won't.
MJ photos are higher quality with easier prompting IMO, but with a distinctive style. Even if you ask it to mimic some other style, it has that midjourney feel.
I mainly it for generating setting or character images for a D&D game. I use Midjourney more for characters.
[0] This is at ~25 iterations.