We tested Scylla and Apache Cassandra on a 3-node cluster using RF=3 and CL=QUORUM. You can find detailed report here.
Here’s the gist of the results. The table presents average operations per second in the whole cluster by workload:
Apache®, Apache Cassandra®, are either registered trademarks or trademarks of the Apache Software Foundation in the United States and/or other countries. No endorsement by The Apache Software Foundation is implied by the use of these marks.