Well, maybe not so tough, really. The EoD is a significant piece in the ROO history, and may be considered more collectible by many. But if it were me and I were listening to my heart, I would choose the Survivor without a doubt. I find it to be the most interesting ROO of all. It really pushes the limits of the Royal Oak invert compelling ways. I also think it is beautiful and a real beast of a watch. I hope to have me someday myself.