Master's in agribusiness management involves more in depth study of agribusiness topics, unlike MBA in agribusiness where the focus is not just on one aspect of agribusiness but a wider areas of discipline of business.

Now, the choice between the two lies in the fact where does one want to focus on, whether it's just  areas related to agribusiness or catering to a variety of roles as the scope for MBA in agribusiness is varied.

Hope, this helps.