Google Eventarc is a tool for ingesting events and delivering them to destinations, but it has limitations. It's suitable if you only integrate with Google Cloud products, but it may not be the best choice if you need to integrate with non-Google systems. Eventarc doesn't transform or enrich events, and it effectively disposes of events once they've passed through the system. In contrast, Hookdeck is an all-in-one event gateway solution that can integrate with a wide variety of external data sources and destinations, offers complex in-flight processing, and provides a range of supplemental tools. Amazon EventBridge offers point-to-point event delivery with some limited in-flight processing, but it's more difficult to work with than Hookdeck due to its custom event format and reliance on a custom API for integrations. Azure Event Grid uses a pub-sub model that simplifies management as your system grows, and it provides two ways to consume external events: MQTT and HTTP pull delivery. Confluent Kafka is the most versatile and complex of the alternatives, offering great flexibility but at the cost of operational and development complexity. Ultimately, the choice of event gateway tooling significantly impacts your ability to deliver reliable functionality, minimize operational costs, and meet deadlines, so it's essential to consider factors such as ease of use, integrations, control over events, monitoring tooling, and error handling when making a decision.