@[email protected], as far as I can tell, you always use Bing Image Creator.
And as far as I can tell, @[email protected] always uses Midjourney.
I don't use either. But as far as I know, neither service currently charges for generation of images. I don't know if there's some sort of different rate-limit that favors one over the other, or another reason to use Bing (perhaps Midjourney's model is intentionally not trained on Sailor Moon?), but I do believe that Midjourney can do a few things that Bing doesn't.
One of those is inpainting. Inpainting, for those who haven't used it, lets one start with an existing image, create a mask that specifies that only part of the image should be regenerated, and then regenerate that part of the image using a specified prompt (which might differ from the prompt used to generate the image as a whole). I know that Thelsim's used this feature before with Midjourney, because she once used it to update an image with some sort of poison witch image with hands over a green glowing pot, so I'm pretty sure that it's available to Midjourney general users.
I know that you recently expressed frustration with Bing's Image Creator's current functionality, wanted more.
Inpainting's time-consuming, but it can let a lot of images be rescued, rather than having to just re-reroll the whole image. Have you tried using Midjourney? Was there anything there that you found made it not acceptable?