They seem to be pretty similar in configuration. For my occasional use I can justify the price of the Robin easier than the price of the Dragonfly, but I'm wondering if there is a big quality difference.
My idea would be to carry one of these in spyderedge in addition to my EDC PM2. I could use it if I had a task that was better suited to a serrated edge, and I could use it if someone wanted to borrow the knife and use it to cut something that I didn't want to cut with the PM2. (Or even if I wanted to cut something that I didn't want the PM2 subjected to.)
My idea would be to carry one of these in spyderedge in addition to my EDC PM2. I could use it if I had a task that was better suited to a serrated edge, and I could use it if someone wanted to borrow the knife and use it to cut something that I didn't want to cut with the PM2. (Or even if I wanted to cut something that I didn't want the PM2 subjected to.)