I've tried NovelAI and MidJourney. Both were pretty decent for producing interesting images, but neither were perfect. They both struggled with getting 2 people to do complicated actions close to each other without messing up a limb or two. It was pretty fun to use for a while but it quickly got kinda old, with it just producing the same basic scenes over and over, Midjourney especially was difficult because they filter the NSFW stuff, so you have to be sneaky to get anything remotely interesting.