Perhaps beneficial to companies utilizing multiple clouds wanting 1 tool and 1 process for auditing across clouds

note - I'm the project's maintainer

Correct, Scout Suite is inherently multi-cloud and has mature support for AWS/Azure/GCP. This is very useful for organizations that want to leverage a single tool to assess the posture of all their environments.

note - I'm the project's maintainer

AWS Inspector allows assessing the baseline security of EC2 instances / hosts, i.e. against CIS benchmarks (https://docs.aws.amazon.com/inspector/latest/userguide/inspe...). Scout Suite assesses the security posture of the cloud environment as a whole, across all [supported] services. It looks at things such as encryption, configuration of Identity and Access Management, resilience, backup configuration, privilege escalation vectors, etc.

This is equivalant of the AWS CIS Benchmark if you use Security Hub. It is also way cheaper.

note - I'm the project's maintainer

And also implements a bunch more rules ;-).