I get lots of questions about why RTC over subversion. If you are only interested in source code management, and none of the other features, you still have a compelling reason to use RTC over SVN. Here are few examples (courtesy of jazz.net).
Storing source code changes: Rational Team Concert v. Subversion
Sharing work: Rational Team Concert SCM v. Subversion
Associating changes: Rational Team Concert v. Subversion + Jira
So, can you suspend your code in your SCM tool?
Can you share your partial code without delivering it, and not leaving the IDE?