I vote neither. I studied an MBA and thankfully what I got from that is that being an entrepreneur is the best choice if you have the opportunity to attempt it

I vote neither. I studied an MBA and thankfully what I got from that is that being an entrepreneur is the best choice if you have the opportunity to attempt it. I went into the course hoping to climb the greasy pole of corporate success and came out wanting no further part of it. I would say studying a Phd is unlikely to lead to commercial success unless you're of a very entrepreneurial bent going into it, and have a strong desire to create commercially useful (and exploitable) research as your focus. The simple fact is a good entrepreneur can easily find useful research results to commercialise if that is what they want to do. That said, anyone who wants to be an entrepreneur could do worse than devote some time to studying aspects of marketing, accounting and finance that an MBA course provides. Recently I spoke to a guy who had a successful business but had to throw it in and get a job because he amassed a tax liability beyond his ability to handle, simply because he didn't understand how taxes worked.