Both ipu cet bba or Aima ugat BBA are good option. Actually it totally depends upon you that is what's your priority, both exams provide colleges of almost same standard, you can go for any taking care of the time, questions, difficulties, no. Of candidates apperesd, easy to get a college etc.
Last year both the exams were on the same date.
It is advised to give one exam and score good in that exam
its upto you