Reading this post was most interesting. I moved from Pinnacle Studio 15 to VS5 not because Studio 15 was a poor editor but because it was "buggy" and quirky. I am slowly getting used to VS but, probably, because of the different way Studio 15 dealt with files, I still do not yet have the confidence dealing with VS.
My experience with Pinnacle and Avid support was very mixed and mostly poor. (I have not dealt with Corel support) but the Pinnacle forum was excellent and very supportive. I am now finding that the VS forum is equally as good and helpful.
In my case Pinnacle Studio (5) came as a freebe with my Canon camcorder and I stayed faithful up to 15. I was intending to upgrade to Pinnacle Studio 16 (which is a rebadged version of Avid Studio 2) when I had a minor problem with 15. I ran the installation disk to carry out a repair run only to find that the repair and uninstall options had disappeared. The outcome was that I had to let my computer dealer sort out the mess and wipe Pinnacle Studio from my PC.
He suggested I try the Trial download of VS5 as, he claimed, it gave less problems than Pinnacle. After a few days, I ordered the disks for VS5 Ultimate.
Now Corel has both VS and Pinnacle, I hope we, as consumers, get the best of the bunch. On balance I am finding VS more user friendly than Pinnacle and certainly more intuitive. If I have any gripe it is with the User Guide which, like most of its kind, explains the obvious but ignores the important detail of how the program operates in its environment. If there is one major difference it is SmartSound which is very limited, as supplied with VS, compared to Scorefitter in Pinnacle. VS has the advantage of the multiple video and audio tracks compared with Pinnacle 15. (this would be corrected in Pinnacle 16)
I have not run VS5 for long enough to claim one is better than the other but I certainly feel more relaxed running the VideoStudio software compared to Pinnacle.
I used to be indecisive. Now I'm not so sure.