What does each quality cost, and which should I pick?
Every export produces the same 15-second scene and soundtrack — only resolution, credit cost and file size differ. 480p (20 credits) is enough to judge faces, motion and scene. 720p (45) is the practical default, sharp on phones and laptops. 1080p (80) is for big displays or post-editing. Unsure? Start at 480p — it costs less than half of 720p, and you can re-export higher once the result is right.