It is not a question better; they are just different. If you plan on seeking overall senior management positions, then an MBA might be the better choice. However, if you plan on enhancing your accounting expertise, than a Masters in Accounting would be the better choice. You must look at your overall career goals and objectives and pick the right fit that is particular to you.
Do a SWOT analysis and look at each degree separately. Look at its Strengths, Weaknesses, Opportunities, and Threats. Compare the two and see which one is more likely to suit your specific needs, wants, and desires. This will give you a good start.
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