BackstoryAI offers Free Trial, but Stable UI does not.
The starting price of BackstoryAI begins at $1.99/month, while pricing details for Stable UI are unavailable.
Stable UI offers several advantages, including Dashboard for image generation, Variety of preset options, Options to save/load images, Customizable width and height, Different models to choose and many more functionalities.
The cons of Stable UI may include a Complicated user interface, Absence of tutorial/guides, Overwhelming options for beginners, No evident version history. and Doesn't support mobile devices