I apologize if this has been answered already and my search-fu is just weak. At what point must the choice be made for units with multiple skill options? For example, Odalisques have "Sixth Sense L2 / 360° Visor" listed in their special skills. Do I choose which during army list construction? Immediately after deploying the model? At the end of the deployment phase? All seem reasonable, but I just don't know. Incidentally I am unable to find any rule which covers these types of unit entries with skill choices. If someone can point out where that's explained, I would be most thankful.
When deploying a model you must declare all open info to your opponent, I'd say that includes your choice. This would also match booty/Metachem.