The SOC 1 has a completely different purpose than HITRUST. Typically a company would perform both if they are a TPA processing medical claims and other claims, where, there is responsibility for financial reporting and maintaining security over the information being handled.
What is SSAE 18 (formerly SSAE 16)?
The SSAE 18 audit standard is a framework for reporting on an examination of controls at a service organization relevant to user entities’ internal control over financial reporting.