I have owned several Leathermens SOG Powerlock, and several Gerbersbut not the Swisstool. I hear that one is the best.

To be completely honest, I was not happy with any of them. I like the Gerber because you can open it in 1/4 of a second and use it one handed. It is my favorite when I don't need a really high quality tool. Generally when I am using a multi tool, I don't expect it to be high quality.