The AIP-SSM module utilizes Trend Micro signatures to stop network worms only. The AIP module is not designedto defend against file-based viruses and spyware.
At a high level, choosing between the AIP module and CSC module is based on what you're intending to protect.
The AIP module provides IPS to protect servers and other network assets from worms, hacker attacks, zombies, etc.
The CSC module protects client computers from content-based threats, such as viruses, spyware, spam, and phishing attacks. In addition, the CSC module can filter and block URLs and e-mail content.