I use both but StableDiffusion has better control over the workflow. With automatic111 I can generate a matrix of output based on prompt variations or parameter

I use both but StableDiffusion has better control over the workflow. With automatic111 I can generate a matrix of output based on prompt variations or parameter changes. I can also do bigger batches. And I can open multiple tabs and queue up several prompt variation matrices at once, then leave for an hour. I have a laptop rtx 2070 and a 512x768 takes about 20 seconds[0] or so. automatic111 also includes some upscaling AI once you've found the base image you want. 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.