Most of the value of an MBA is captured (or lost) in the initial recruiting/placement following graduation. The half-life is very short. Unless your employer is funding your studies, you should be planning to change jobs upon graduation and basing your choice of schools on the fit between their post-graduation placement and your career goals.
It's a rapidly evolving market, but I've never heard of firms recruiting online programs. Most brick and mortar not-for-profit schools will have some firms and government organizations that regularly recruit their graduating classes. The quality of the opportunities and the salaries provided by those firms will vary greatly with institutional quality and location.
I suppose that you could learn just as much from a good online program, but I doubt that there would be measurable financial return on whatever you invest. The exception would be if your employer at the time of graduation recognized your education and was willing to use it as the basis for promotion to management. Assuming that you plan to remain with your current employer, you can find out most of what you need to know by simply asking whether they have a preference.