Thin CA on tight fitting balsa joints. I like thick CA for sheeting. Keep in mind you need foam safe CA when doing anything with foam or the CA will eat the foam as fast as gas or acetone. I use epoxy when gluing hardwoods, CA just doesn't hold hardwood very well.
When in doubt test on some scrap and see what you like. Most builders have several types of glues on hand, good old Elmer's and most wood glues have made a big come back after the user comes down with a CA reaction.