1. Pricing Model: AWS Step Functions charges based on the number of state transitions in the state machine, while Amazon Kinesis Firehose charges based on the volume of data ingested. This means that the pricing structure for these services is fundamentally different, with Step Functions being more focused on the processing of state transitions within the workflow, and Kinesis Firehose on the amount of data being processed.

2. Use Case: AWS Step Functions are suitable for managing multi-step workflows and coordinating distributed applications, providing a visual representation of the workflow. On the other hand, Amazon Kinesis Firehose is designed for ingesting streaming data and loading it into data stores like Amazon S3, Redshift, Elasticsearch, etc. The key difference lies in the primary use case of these services, with Step Functions focusing on orchestrating workflows and Firehose on data ingestion and delivery.

3. State Management: AWS Step Functions maintain the state of the workflow and allow for easy error handling and retries, ensuring that the workflow progresses smoothly. In contrast, Amazon Kinesis Firehose does not manage the state of data streams, as it is solely focused on ingesting and delivering data without any state management. This distinction is crucial in understanding the capabilities and limitations of these services in workflow management.

4. Integration with Other Services: AWS Step Functions can easily integrate with other AWS services like Lambda, S3, DynamoDB, etc., to build complex workflows and applications. On the contrary, Amazon Kinesis Firehose mainly focuses on data ingestion and integration with data stores like S3, Redshift, and Elasticsearch, making it less versatile in terms of service integrations. Understanding these integration capabilities can help in choosing the right service for specific use cases.

5. Real-time vs. Batch Processing: While AWS Step Functions are well suited for orchestrating real-time workflows with multiple steps and decision points, Amazon Kinesis Firehose excels in batch processing of streaming data, making it ideal for scenarios where large volumes of data need to be ingested and delivered to data stores periodically. This distinction in processing capabilities is essential in selecting the appropriate service based on the nature of the data processing requirements.

6. Monitoring and Logging: AWS Step Functions provide detailed logging and monitoring capabilities to track the execution of workflows, identify errors, and optimize performance. In comparison, Amazon Kinesis Firehose offers basic monitoring features for data delivery, such as tracking records delivered, delivery success, and failure rates. Understanding these monitoring and logging differences can help in effectively managing and troubleshooting workflows and data delivery processes.

In Summary, AWS Step Functions and Amazon Kinesis Firehose differ in their pricing models, use cases, state management, integration capabilities, processing capabilities, and monitoring/logging features, catering to distinct requirements in workflow orchestration and data ingestion respectively.