Some editors will let you try a demo.
I haven't used either. I was very annoyed with a rudimentary pinnacle program that came with a product my Mom bought.
I've heard good things about Adobe Premiere.
I just bought a Canon HV20 and want a video editing software package to make home movies. I've narrowed it down to Adobe Premiere Elements 4 and Pinnacle Studio 11 Ultimate. The main things I'm looking for are versatility, Hi-Def capabilities, and ease of use.