I would suggest you take CBSE board because of the gap in the quality of education they give. In the Maharashtra board, you don't find any in-depth knowledge of any topic, and the topics in it are merely an Introduction. It would be of no value if you choose it. Whereas the CBSE covers the ncert syllabus which is very similar to the JEE syllabus and gives you a good knowledge of the subject and you would also how to apply them. So it would be far better if you do choose CBSE.