Epoxy= good for firewalls, landing gear blocks and such. Provides flexible, more energy absorbing bond. But heavy by volume.
CA=== Good for most applications, comes in fast thin, and thick slow and medium mid. Tends to be Brittle, with little shear strength. Causes headaches when sanding. Oh and if you are exposed to it for long periods, such as building a Kadet wing, it will burn your eyes and throat. Use vent fan.
Wood Glue+ Good all around, light weight, great bond. Comes in Waterproof(outdoor) variety. Sandable. Bad habits? guys? I dont know any.