Here is some information regarding the JMC and Hansraj Maths department based on the experience of my friends from both institutes. 

JMC:

• The Maths department is well-equipped.
• Along with theory, students need to take up practical projects in their B.Sc. This will help you with your CV.
• JMC has one of the oldest placement cells in DU. It is also quite active. Every year they organize campus placements and reputed companies like KPMC, Deloitte, ITC, Accenture visit to recruit students. 
• JMC doesn’t offer hostel accommodation.

Hansraj:

• The student crowd of the institute is quite diverse. You will get to meet people from all over the world.
• The hostel and mess facilities are great.
• Campus life is lively and enjoyable.
• It offers good extracurricular activities.

Go through the above-mentioned points and choose the institute that suits your requirements.