Aipmt has been replaced by neet. So both are same and this is the best option as more number of seats are available through this exam. Aiims and jipmer have comparatively lesser seats and more tough competition. But in either case if you could crack a seat it would be awesome! Best of luck! 

• AIPMT has been replaced by NEET. You have to give this Examination in order to compete for medical seats all over the country.
• AIIMS and JIPMER are institutes that conduct their own Examination for admission in their college(s).
• EAMCET is a state level exam for Agriculture, Engineering and Pharmacy. The medical colleges of the state have only recently come under NEET.
• If you are able to get a good score, then AIIMS would be the best option. However, you need 99th percentile to get admissions in AIIMS. The same goes with JIPMER.