Normally, business degree is easier for I/O Psy degree to find a job, and the salary is better. Job hunting highly depends on your publications. The difference between students in the same department can be huge. Some get at least one offers while others even do not have any job interviews.
The term Clinical Psychology was introduced in 1907 by Lightner Witmer. A recognised field and profession developed through the 20th century, drawing initially on various strands of experimental and psychotherapy (initially behavioral and psychoanalytic), and later from numerous branches of psychology as well from other fields such as neuroscience and sociology.