Hey Anupam,

Both colleges are equally good enough as both of them provide distant learning courses. DU SOL and IGNOU both conduct entrance exam for admission in PG courses. But i would personally suggest you to go for DU SOL as it would be more effective and economical for you and hence DU still be one of the reputed University of India. 

For admission in DUL SOL for pg pol following is  the criteria:

PG Admissions are offered under two categories, i.e., Entrance and Merit-based. 

For PG Courses, 50% seats of the total are filled through merit and remaining 50% seats are filled based on entrance test, GD or PI (if any).

You can check the further details regarding syllubas and cutoffs from the website of DU SOL itself.