IIT is a brand and they are better than any engineering college in India. It does not matter whether the IIT is new or old, IITs are best in terms of faculty and students, which matters for getting a good education.
The directors of all the IITs have financial authority and this empowers them to do the best for the institution. The directors of other engineering institutes lack this authority and thus this puts certain restrictions on their functioning.
Earlier, it was believed that IITs are only meant for research purposes and only those should study at IITs who want to pursue research in engineering and technology. But over years, this theory was put to an end.
However, remember that just having the tag of an IITian does not assure a stellar career. It depends on your hard work and perseverance. You can achieve anything that you want in your life by working towards it every day.
The “IITian” tag is enough. IIT Tirupati has maintained good standards like any other IIT. You should go for it.