Tezpur University is a central University, whereas Kaziranga University is private. So the quality of education is better at TU. Also, the placement trends of the university have been quite good over the years. In the recent placement drive, the average CTC offered at the university was 3 LPA. So, for an MBA it is definitely the better option. 

But when it comes to MBA, IIMs are the best choice. It’s better not to choose Govt. or private college for a professional degree like MBA.