We use a nightly build and test environment with TestComplete. The ProjectSuite test run takes 12h and has a huge test result tree. It is pretty complex to compare the actual ProjectSuite test resu...
In our case, we don't use QAComplete.
We also don't have a 'real TestManager', we work agil in small SCRUM-Teams.
In my opinion the TestComplete responsible persons should be able to do the DIFF of test logs, because they create, change, execute and know the test cases and they can rank the new deviation of this 'list'
(then commit this to their Testmanager or QAComplete)