Hi Wendy,
I think the types of things you are interested in, really have a passion for and will excel at the most will lead you to have the biggest ROI. Furthermore, having a certificate in hand from either course won't give you any type of ROI..what you do with that knowledge will. So, think about the things you want to learn and the services you want to offer to your clients.
I had Craig on my podcast once and honestly, I think you will learn some great things in either course. Whichever way you decide to go..good luck..and remember..isn't the knowledge you have, but what you do with that knowledge that matters the most