The short answer is "message acknowledgements". RabbitMQ can be configured to require message acknowledgements. If a receiver fails the message goes back on the queue and another receiver can try again. While you can accomplish this in Kafka with your own code, it works with RabbitMQ out of the box.
In my experience, if you have an application that has requirements to query a stream of information, Kafka and KSql are your best bet. If you want a queueing system you are better off with RabbitMQ.
