When I finished my undergrad I was struggling with the same dilemma but I realized that I was not made to handle clinical work so decided to join corporate world in field of HR. Though I have yet to do my grad studies (Applying for Fall 2018) but I have also realized that you can make good money with either of the 2 degrees. You can pursue Clinical Psych and after couple of years you can have your own private clinic and similarly you can startup you own consultancy firm with a degree in IO. So either way money will follow you as long as you are passionate about it.
Just a glimpse in HR consultancy, I usually clock in 60+ hours a week but the fun is I get to network with HR leaders from ALL industries and get to travel new cities.
All the best !!!