Hello student both books are equally good but I'll suggest you to go with MTG NEET Guide as it has more practice questions.

But I request you to please not directly jump to any reference book like MTG or any other. Prefer NCERT to build your basic concept and make sure you do each and every example and exercise questions of Ncert before jumping to a reference book after completing ncert thoroughly refer to your coaching material or any reference book.

You can also subscribe to careers360 knockout package knockout package for preparing and qualifying the entrance examination, it offer you 100 percent money back guarantee if you do not qualify.

Refer to the link - https://learn.careers360.com/knockout-neet-may/

Feel free to comment if you have any doubt

Good luck