There are so many video editors out there (at least half a dozen during my search), and I wonder which is the most advanced among them? How does it compare with commercial offerings?
There are different ways of rating video edition software, and depending on which attribute (features ? user-friendliness?) you want to focus on, the answer to your question will be different.
Assuming you mean "Which Open Source video edition software is the most complete (it terms of features)", then the answer is probably Cinelerra.
To get an idea of how it compares to other video edition software, I suggest you have a look at the appropriate Wikipedia page.
http://www.linuxalt.com/ shows Linux equivalents for Windows software; that might help
I've only had a little experience with this, but I rarely need to edit video. It crashed a few times when I used it about a year ago, but maybe it was just me or it's improved. It's fairly easy to use as well.
The screenshots on the site show it in KDE, but I don't think it depends on KDE. I could be wrong though.