There both pretyy heave duty octocopters, but the one with the bigger motors From what Ive heard has massive lifting capabilities. I was told by the guy I bough them from that they are in good working order, but I dont have controllers, Have not idea how to fly them, and Im happy sticking to Arducopters.I would like to sell possibly the small one only, but if A good offer comes my way I may sell either. Just make me a fair respectable, no haggle offer, Ill check with a few of my fiends who are into these to see of ot's a fair price.....and if it is then one or both are yours. you can reach me at wbarfels at gmail