The concrete job here is not "can it generate screens" but "can it produce a small business app with logins and per-user data isolation without turning maintenance into the product." Emergent and VibeCode genuinely diverge on that job because Emergent is oriented toward broad full-stack web scaffolding, while VibeCode is oriented toward native mobile app generation with a more transparent usage model.
That difference matters because logins expose the failure modes that actually hurt. A generated to-do list is easy to demo; generated auth flows, database permissions, schema changes, and bug-fix loops are where teams discover whether they built software or just rented a convincing prototype.