I have no experience with the Dfly, but I do have both the G10 and the FRN Delica versions, which are identical save for the handle material. I would say it depends entirely on you and your use. I prefer G10 generally, so I expected the G10 Delica to be my favorite, but it really didn't turn out that way. It has a special place in my collection as an upgraded Delica for when I'm feeling fancy, but the Delica is such a great user that the FRN really fits well with its design. As such I carry the FRN version more, since it's lighter, replaceable, and I don't feel like I'm giving up any strength. I would imagine that the Dfly would be similar, since it's even smaller than the Delica. My advice would be to buy a FRN version, and if you don't love it you can always buy the G10 version later on. Never hurts to have a spare beater knife around anyways.