[barrkel]

You don't need me to search the internet for you, but https://thenewstack.io/apache-gets-another-real-time-stream-... has some comparisons.

There's also Apache Beam, which is an API for streaming, and has Flink and Apex execution engines. Google's Cloud Dataflow is another implementation of Apache Beam.

As to which one to choose, you need to evaluate them, there's no simple answers. If you have Hadoop already then Apex may be a better fit than Flink; OTOH if you do Akka stuff already, then Flink might integrate better with your stack. If you have more batch than streaming use cases, maybe you want Spark. Etc.