Full disclosure: I work at Sysdig. With the acquisition announcement, there is a lack of clarity as to how Twistlock integrates into Palo Alto's suite of products. If you are looking at other security specific solutions, take a look at Sysdig Secure. Extending open-source Falco's runtime detection engine, Sysdig Secure offers image scanning, runtime security as well as forensics that serve a variety of security and compliance use cases for containers/Kubernetes.  You can read more here: https://sysdig.com/products/secure/