Short answer / recommendation
Choose Leonardo AI as your primary engine for a 50‑asset seasonal campaign when you need repeatable, templateable, and controllable art direction. Use Midjourney only if you want looser, highly stylized painterly results that you plan to refine manually. Use ChatGPT to generate and iterate prompt templates, variation matrices, and SOPs for the team.

Why I recommend Leonardo
- Leonardo gives finer parameter control (model/version locking, image-to-image, inpainting, granular style controls) and generally better cost/throughput for batch work. That makes it easier to produce consistent assets from templates. Midjourney often shines for creative discovery and unique looks but is harder to lock down for precise, repeated outputs at scale.

Decision criteria (pick the most important for your project)
- Consistency & repeatability: Leonardo wins. Lock model/version, use reference images and fixed seeds.
- Templateability (masks, inpainting, batch runs): Leonardo wins.
- Highest-fashion/painterly aesthetic: Midjourney stronger if you’re okay with more manual curation.
- Budget & throughput: Leonardo tends to be more cost-effective for many renders.
- Team skill & scale: If you have a technical ops/AI prompt engineer, Leonardo + prompt library is best. If small team and visual iteration is primary, Midjourney’s community styles are faster to explore.

Practical checklist to run the campaign (use for first 10 tests, then scale)
1) Lock your creative system: pick one model/version and agree on color palettes and aspect ratios.
2) Create a master style brief (2–4 sentences) and 8–10 example reference images.
3) Build 5–10 prompt templates covering hero, product closeups, lifestyle, and background variations.
4) Use one reference image per template plus fixed seed(s) for consistency. Save seeds and model settings.
5) Batch-generate 3–5 variants per prompt, flag top picks, then do 2-pass refinement (inpainting/masking for layout elements).
6) Export high-res, then run unified color grade/LUT for brand cohesion. Keep nondestructive files for edits.
7) Document prompts, seeds, model version, and post-process steps in a shared SOP (use ChatGPT to scaffold this doc and generate prompt permutations).
8) QA checklist: brand colors, typography placement, safe zones, product visibility, aspect ratio crops, file naming conventions.

Best-for / Avoid-if
- Best-for Leonardo: campaigns requiring repeatable style, templated layouts, inpainting/masks, and efficient batch runs.
- Avoid Leonardo if you primarily want exploratory, painterly looks and don’t need strict repeatability — Midjourney may produce more serendipitous results.

Final notes
Budget, team skill, and the stage of workflow matter. If you’re early-stage concepting, start with Midjourney to explore directions, then port the winning look into Leonardo for templating. Use ChatGPT to generate prompt variants and to create the SOP and QA checklist. If you want to start now, test 10 assets on Leonardo with locked seeds and a shared style brief — iterate from there.

Compare Leonardo AI and Midjourney