I started off editing in Vegas 8 and haven't found a better editing program to date. I am using the current 13 Pro version. I still believe it's the fastest and more efficient editor out there (though it does tendy to be glitchy sometimes when working with a lot of seperate image files and transitions.
In the past I've used Premiere and After Effects, for various reasons, Final Cut Pro and Avid Media Composer.
Out of all of them, I'd say my least favorite is Final Cut Pro 7. I really, really dislike that program, but I needed to use it for my apprenticeship. I'm flexible. Honestly, I think it's just the preference of the editor. They all do just about the same thing, just with different buttons and set ups.