Audit management

I’m assuming that by “ISO 27001” you mean “ISO 27001 Toolkit”

Considering that, if you plan only on managing audits, the toolkit would be the best choice, because you can use only the documents related to internal audit.

Conformio is a platform to manage the whole implementation and maintenance of an Information Security Management System from definition of security objectives to continual improvement, which requires much more effort to manage (e.g., document management, risk assessment, and treatment, incident management, etc.).