What versions are you using / planning to integrate?
Check these references for background:
CA Green Books - Service and IT Asset Management - CA Technologies
My Rule of Thumb:
If your primary business needs are driven by the advantages of a shared MDB; then install the ITCM (Client Automation) Enterprise. The downside is that all integrated products must be shutdown when performing MDB related patches/upgrades.
More details will help others here to advise.
J.W.