No, the main upside of running your own SD web UI is that you can select and deploy your own checkpoints (not just using the base SD models), LoRas, embeddings, upscaling models, and UI plugins supporting additional services/models/features like multidiffusion (bigger gens and controls of which areas within the image different prompts apply to), ControlNet and associated models, video synthesis, combinatorial prompts, prompt shifting during generation to do blending effects, and, well, a million other things.

Also, you can completely automate it.