How can I explain to my mum that it's better to take IIIT Delhi or IIIT Allahabad than taking admission in IIT Tirupati, Bhilai, Palakkad or Dharwad? She is very insistent on me getting that "IIT TAG"

IIIT Allahabad has good placement figures, and all the major companies visit its campus each year. Not only that, the college has a strong alumni network and brand name.

Try to tell you mom that the ‘IIT’ tag does not hold much value for 3rd gen. IITs. These colleges have just sprouted, and it will take some time for them to create a strong presence. 

All the major Product and Service based companies like Apple, Google, Microsoft, LinkedIn, Qualcomm, Walmart, Flipkart, Amazon, Samsung, Intel, Goldman Sachs, Deloitte, Atlasian, Sprinklr, Zomato, Oracle, Paytm, Airtel, Swiggy, ICICI Bank, Citi Bank, etc. visit the campus during placement season. The average package for IT is more than 24 LPA, and the median package is more than 21 LPA. You’ll receive top coding culture and senior mentoring at IIITA, even better than some well known IITs. 

IIIT Allahabad is better than top NITs and 2nd gen. IITs. Its placements are even better than IIT Gandhinagar. Brand name matters, but other factors need to be checked as well. According to me, IIIT Allahabad is the best college for those who successfully clear JEE Mains.