Short answer / recommendation:
For 100 SKU lifestyle mockups where you need consistent style, fast turnaround, and clear commercial use, pick Leonardo AI as your primary generator and use Midjourney selectively for a few hero or high‑touch shots. Leonardo wins for template-driven batch workflows and tighter control; Midjourney wins when you need the absolute highest artistic/photoreal fidelity and are willing to spend extra time curating.

Why (decision criteria):
- Consistency & batching: Leonardo has stronger built‑in templating and batch generation workflows, which reduces per‑SKU manual work. Midjourney can be scripted but requires more manual prompt/variation management.
- Control: Leonardo’s scene templates, param controls, and asset reuse make it easier to lock a look across hundreds of SKUs. Midjourney is more “creative” and can drift between prompts unless you rigidly control seeds/parameters.
- Fidelity: Midjourney often produces richer, higher‑polish renders for hero images; Leonardo is very good for clean, ecommerce‑ready shots but sometimes a hair less stylized.
- Licensing & commercial clarity: Always check current TOS. Leonardo advertises commercial use options and project licensing suitable for ecommerce; Midjourney allows commercial use on paid tiers but has specific rules — verify before publishing.
- Speed & cost: For large volumes, Leonardo’s batch features typically save hours and cost less hands‑on time. If you have developer resources, you can automate Midjourney with APIs/community tools but that adds complexity.

Best‑for / Avoid‑if
- Leonardo AI: Best for bulk SKU mockups, template-based scenes, fast turnaround, teams that want minimal per‑image tweaking. Avoid if you insist on ultra‑artistic/unique hero imagery.
- Midjourney: Best for hero/product spotlight shots with high fidelity and stylized looks. Avoid if you need to push out 100 consistent images on a tight schedule without heavy manual QA.

Practical checklist (ready to run):
1) Define a style guide: camera angle, lighting, background, model styling, color grading, and allowed props. Keep it as concrete as possible.
2) Create 3–5 prompt templates: base prompt + slots for SKU name, color, logo placement, negative prompts for artifacts.
3) Make a master scene/asset pack: neutral model or mannequin images, masks, and one or two background plates to keep uniformity.
4) Run small test batch (10 SKUs): lock seeds/settings, iterate until look is consistent.
5) Use batch generation: Leonardo’s project/template batching or your Midjourney automation pipeline for full 100 SKU run.
6) Automated QC rules: check aspect ratio, background spill, logo legibility, and resolution. Flag failures for re-render or light retouching.
7) Postprocess & export naming: consistent filenames, metadata with prompt + seed + license snapshot.
8) Save license screenshots and export receipts for each image before publishing.

When the right answer changes:
- If budget is tight and you must avoid custom dev, Leonardo is usually faster and cheaper per SKU. If you have a small team of creative directors and want the absolute top look for marketing, use Midjourney for selected hero images.

If you want, I can draft 2–3 prompt templates and a QC checklist tailored to your product category (apparel, home goods, electronics).

Compare Midjourney and Leonardo AI