Carpenters glue (Tite Bond II, Elmers Carpenters Glue) for most glue-ups, epoxy for high-stress areas or areas requiring strength. Occasionally I'll use CA where I want a quick glue-up but not very often, and hinge glue for gluing pinned hinges (I don't use CA hinges).

Hogflyer

edit: For the next foam core wing I do I'll be using polyurethane (Gorilla Glue or similar) to glue the skins both together and to the core all in one shot.