Use the service when you have specific requirements that the basic Vision service's image analysis can't provide. For example, it's good for recognizing unusual objects, manufacturing defects, or providing detailed custom classifications.
Don't use the service if you need basic object detection or face detection. Use Face or Vision services instead.
Don't use the service for basic visual analysis. Use vision capable models from Azure OpenAI or open-source models in Azure Machine Learning instead.
Reference:
https://learn.microsoft.com/en-us/azure/architecture/data-guide/ai-services/image-video- processing