Use Midjourney when art direction is still open
Midjourney is strongest before the production brief is locked: moodboards, campaign concepts, character looks, editorial illustration, and high-impact visual exploration. The creative-office source brief keeps Midjourney in the image-aesthetics lane and records plan details around Basic, Standard, Pro, Mega, Relax mode, Stealth mode, and commercial-use caveats. That makes it a better discovery tool than a universal production system.
Choose Firefly when editing and brand governance matter
Adobe Firefly is easier to justify when the asset must move through a design department: edits, brand governance and review, Adobe app handoff, marketing production, and commercial workflow documentation. The comparison should not claim Firefly always produces better images. Its advantage is operational: teams can keep generative work closer to the design stack they already use and the approvals buyers expect.
Compare rights, privacy, and editability before quality claims
For commercial teams, the deciding evidence is often less about a single beautiful sample and more about repeatability: who owns the output, which plan is required, whether private generation is available, how easy edits are, and whether the asset can survive brand review. Treat prompt tests as evidence for style and adherence, then verify licensing and workflow constraints before publishing client or brand work.