Jig types

Do you feel that certain conditions immediately call for a hair jig more than a plastic and visa versa?

I don't fish hair jigs much but if I do it is under a slip bobber fishing for black crappie on rocky banks and points or redears/bluegills in bedding areas. The bulk of my jigging is with plastics and of that I'll use curly tail jigs 75% of the time, both longlining or casting.