First of all, I haven't used Video Studio. I have been using Pinnacle Studio Ultimate for many years, with a short stint using Avid Liquid and Media Composer in between. While Liquid and Media Composer are much more stable, Liquid is no longer available and Media Composer is much too expensive for home use.
All that said, Pinnacle Studio has most of the features anyone could possibly want in a video editor. If you use normal video clips to edit, Pinnacle is very efficient. If, however, you try editing a long (such as an hour long clip) into very short Individual clips, Pinnacle will really bogg down. This can happen if you have imported video from another application, in which you have created one long video clip, as opposed to individual clips based on time or when the record button was pressed.
Anyway, the latest version of Pinnacle Studio has vastly improved how special effect keys are added and manipulated. The process is much more understandable. I could go on, but, you can see all the features by going to the Web Site.
For me, besides all the features, what I love about Pinnacle Studio is the integration of Smartsound, a separate music application that has to be purchased separately. Pinnacle Studio has its own music feature, but, not as robust as Smartsound. Smartsound will add music to a track of clips and when the clips are edited, by extending or shortening them, Smartsound will completely edit itself to match the new clip lengths. The music keeps the beginning of the music selected and recompose the middle and end of the music. The Smartsound music has to be purchased and can get expensive, if you want a lot of variety. Go to
www.smartsound.com for more information. This feature, alone, made me buy Pinnacle Studio.
Pinnacle Studio Ultimate has additional features that make the small extra price worth it. Corel has specials throughout the year, so you can usually get their software for a really good price. Personally, I would just take a chance on Pinnacle Studio Ultimate. It comes with 21 days of free access to StudioLot, which has training videos to get you started. Even if you hate Pinnacle Studio (which you won't) you have only spent about $100 to experience it and you may fall in love with it, like I have.
I hope this helps.