One time ago i would have told you if you want more stability to use 1.1.3 because RCs weren't so stable, but 1.2.0 RC6 is the first one that completely satisfied me in terms of support and stability. For me, 1.2.0 with RC6 has become better than 1.1.3, even if sometimes crash (thing tat also the old did), it has a larger and more stable vst support new functions and a great new design, and is becoming better for one RC to another. But, developers are near to release a 1.2.0 stable release, so maybe you prefer to wait for it.
Summary: For me 1.2.0 RC6 is better