We already know that we should refer only NCERT book, but it is ok for understanding concepts but we need problems more and more so that we can do good performance in NEET. So, that we are asking which book is better for solving problems.

First of all, complete your NCERT then you can consider standard books like Dinesh objective's theory. It is advisable to give your maximum time to NCERT as compare to other reference books because most of the NEET syllabus is based on NCERT so plan your preparation accordingly.
Good Luck!!!

• Dinesh objective for Biology is too far-fetched for what is required for the scope of the NEET Examination. If you really want to invest in a book, MTG OBJECTIVE QUESTION BANK would be a better book to buy!

• However, I want to emphasize that NCERT TEXTBOOKS FOR BIOLOGY is the epitome. You will need to study every line, every minute details, pay close attention to diagrams and figures if you want to crack NEET!
  

• The other books are only for practise. Your core concepts should be strengthened through these NCERT books alone! Do not buy too many reference books lest you get flustered. So stick to NCERT and you will do well!