Midjourney is the strongest fit for generating editorial illustrations that match specific visual guidelines, as its style reference and image prompting features let you anchor outputs to an existing visual language with fine control over mood, palette, and composition. You can feed it reference images and use parameters like stylize and aspect ratio to keep results consistent across a series. Ideogram is worth considering if your guidelines require accurate text within the illustrations. DALL-E integrates tightly with ChatGPT for iterative prompt refinement, which helps when guidelines need to be described in natural language. Stable Diffusion is the best option if you need full control through fine-tuning or custom model training on your own style assets.