Comparing competitive exams or choosing one over the other is a very illogical thing to do. The entire agenda behind a competitive exam is to build your knowledge and test you on the basis of the same. So unless you defer from gaining the right set of knowledge, any competitive exam will bear the same result.
I have a very effective technique to tackle this issue. Prepare in such a way that you are appearing for JEE Advanced. This is because the course and structure of Advanced are such that once you are ready to clear that, you can clear every other exam too. This means your focus will not be divided and all you can do is focus on one exam.
Keep focusing on the preparation for JEE Advanced and when your BITSAT is around the corner start solving mock tests to improve your speed. Prepare additionally for English and Logical Reasoning questions. BITSAT focuses more on your speed than the clarity of your concepts. So a mere preparation of 3 months before BITSAT is more than enough provided that your concepts are clear from JEE Advanced preparation.
So instead of choosing one single exam, prepare for JEE Advanced and target both as the future is unpredictable.
350+ in BITSAT is achievable if you are dedicated.
You can benefit more by going through your class notes and memorizing formulae rather than buying many BITSAT specific books.
Many aspirants go through the same conflict. The preference depends on your career priorities and aim.
Some points are discussed below which may be helpful in deciding.
Thus, you should choose the date as per your priority and comfort. Decide by judging your nervousness, preparation and then give priority to your choice.
JEE Mains and BITSAT both have similar levels of difficulty in terms of the types of questions they ask. However, JEE Mains questions may be a bit trickier, while BITSAT requires both accuracy and speed. To excel in BITSAT, you should work on improving your speed and accuracy.
You may have had the same thoughts about which exam to take, and considering BITSAT. One helpful tool you can use to prepare for these exams is the Melvano app. By using this app, you can improve your speed and reinforce your concepts. Although the author of the statement eventually took JEE, they still recommend downloading the Melvano app to assist in your exam preparation.