Short version: For Amazon, real product photography or 3D renders are the safest way to guarantee white-background, true-to-scale images. Midjourney can produce a photorealistic single shot but often struggles with exact scale and consistent pure-white backgrounds across multiple listings. If you use Midjourney, standardize a prompt template (focal length, distance), reuse the same seed/reference image, generate multiple views, then mask/composite to pure #FFFFFF and verify scale against a reference object.

Compare Midjourney vs Leonardo AI for fidelity and consistency: Compare Midjourney and Leonardo AI