This is one of the biggest doubts among the JEE and NEET aspirants. If you start comparing the questions in both the books, you will not find much difference. Also, Cengage books have tons of questions of the same level, which is not very fruitful.

DC Pandey has great questions, in addition to the theory which is really well explained. Also, the placing of questions across a particular topic is very good in DC Pandey.

Therefore, DC Pandey is a better book for engineering and medical aspirants alike.