Midjourney edges out Microsoft MAI-Image-2.5 by 0.4 points (7.8 vs 7.4) -- a B-tier vs B-tier split that's narrow but real. Not a blowout; both belong on a shortlist. The score gap shows up most clearly in the categories that matter for Midjourney's strengths, so if those categories are your priority, the lead translates.
On pricing, Microsoft MAI-Image-2.5 starts free while Midjourney requires a paid plan from day one ($10+). If you're testing the waters or running an occasional workload, that gap matters more than the score differential. Microsoft MAI-Image-2.5 starts at $5 text / $8 image-in / $47 image-out; Midjourney starts at $10. Compare what each entry tier actually unlocks before you compare list prices -- the limits matter more than the headline number.
By use case: pick Microsoft MAI-Image-2.5 when microsoft shops already on azure or m365 copilot who need a first-party image model without an openai dependency. Pick Midjourney when artists, designers, and content creators who need the highest quality ai-generated images and don't mind the discord workflow. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in Midjourney's lane, the tier-list ranking and the use-case fit point the same direction; if you're in Microsoft MAI-Image-2.5's lane, the score gap matters less than the fit.
Bottom line: Midjourney is the safer default for most readers, but Microsoft MAI-Image-2.5 is competitive enough that the tie-breaker is your specific workload, not the spec sheet.