Creators account uses the first one, Advanced account can use any of these three. Takes 2-4 seconds to generate an image. 
Discussion
This are dope models..one more question can the resolution of image be altered? I mean beyond 1:1 and do 15:9 5:8 etc. Probably could be a part of prompt.
You could experiment with the prompt, but there isn’t a UI way to do it..