Bro this is the best card where HDFC has launched , so easily go for it.
I will say you why , it gives 5% cashback on amazon even for bill payments and recharges , upto 1000 per month which can allow you to pay till 20000.
Also if there are any offers on amazon/flipkart , it gives you additional 5% cashback along with the instant discount on HDFC.
There are rumors' that HDFC Swiggy card is also going to give 5% cashback on online spends , but still we are not sure of the fees , and not sure of the capping also.
So my suggestion is to go for it bro as its being issued LTF for you.
If you want to get Infinia , you can mail them by giving your income docs , they might upgrade to DCB or Infinia based on your eligibility.
If you get millenia as ltf, wait for few months and then ask 2nd credit card from HDFC.