I have not yet tried Pinnacle Studio for 3D video editing but know people who use it and like it. Have to try it!
I am presently using Vegas Movie Studio 12 for 3D video editing and it has been a solid performer for me.
I also use Magix Movie Edit Pro version 18 (MEP) which I like a lot. The newer version, MEP 2013 Pro was introduced last fall but had some problems with the 3D features in particular. However, MEP 2013 also runs about twice as fast for many functions such as MP4 encoding. There have also been at least two updates since last fall that fixed most of the problems. I like the user interface for MEP – and especially like its 3D pair auto synchronization feature.