Both of the institutes are great. But if you want to seasonally distinguish between these two institutes then I would recommend JNU over DU. JNU have more research friendly professors as well as good exposure to the practicality. DU also have these facilities but not to the mark/extent as that of JNU.

**The opinion may differ and this is based on my opinion based on the facts and figures available online.

I would always recommend you to conduct a research by yourself then only select your university/college.

I hope this answer helps. All the very best for your future endeavors!