Joseph Klann provided a useful comparison of the leg designs for the Mondo Spider and Theo Jansen’s Strandbeest at this unfortunately dead link: http://www.mechanicalspider.com/comparison.html. I keep in here in case he brings it back.
Here is an excellent web page about the Klann and Jansen leg mechanisms, as well as other leg designs: Dog Feather Designs.
This article compares the leg designs: Mechanical Spider Using Klann Mechanism
This is a youtube video prepared by William Thielicke that illustrates the two leg mechanisms.