What is a better advance study to get more job opportunities, an MBA or a JD?

I am torn between taking up an MBA or pursuing a Law Degree to further enhance my self and get better and lucrative opportunities. An MBA is easier to obtain considering it only takes 18-22 months to get one. While a JD will take me roughly 4 years on part time school. I am considering the choice especially since I want to be able to still have time for my family.