JMC and Maitreyi, are reputed neighboring colleges with their own advantages. It will be better for you depends on the course you are applying for. For Arts courses, JMC is better. Whereas, for Science courses, Maitreyi is the better choice. I have friends from both colleges and here are their insights about the colleges. 

Maitreyi:

• The faculties of the college are great.
• It organizes many extracurricular activities. There are sports facilities for basketball, volleyball, football, etc.
• It doesn’t have an auditorium and functions are held under a tent.

JMC:

• JMC has better infrastructural facilities. The classrooms are bigger. There is an air-conditioned auditorium. 
• It also organizes many extracurricular activities.
• The canteen is well-maintained and there is availability of variety of foods. 

Both Maitreyi and JMC are well-reputed and have decent facilities. So, choose an institute according to your subject preference.