Quick comparison: Midjourney = very strong artistic/style control but lower native resolution and more variation between runs; you’ll often need its upscaler or external tools (Topaz/Photoshop) for 300 DPI prints. Leonardo AI = cleaner, more deterministic outputs and better native high-res/upscaling options for print-ready art. For both: export sRGB then convert to CMYK in a color-managed editor, avoid rasterized AI text (add typography as vector layers), and confirm commercial print licensing before use.

Detailed side-by-side: Compare Midjourney and Leonardo AI