HELP ME SELECT HDFC DEBIT CARD

I'm 21. I am opening an account with HDFC. The guy has issued me Visa Platinum Debit Card (I am aiming for Millennia). He is saying Platinum is more premium than Millennia.

Can anyone help which one to select? My spends aree mostly online e-comm (food, groceries, shopping, travel) 10k-15k/m, CC bill around 10-15k/m. Goal is to maximise DC spends cashback.