Debit Card for shopping

All are same, every one of them will work with Indian Sellers(mastercard and visa, don't go for maestro), for international sellers you need Credit Cards(sometimes international credit cards will work as well).

No I mean which can provide more and more discounts on online sites like infibeam, buytheprice, ebay etc

ICICI provides the most offers, Axis bank is also providing offers recently, but overall ICICI gives max.

ICICI in my opinion.

Axis is THE best for this IMO. It has worked with all Indian and even foreign Payment gateways(Steam, Apple App store, Google Play etc)

I haven't had even one problem till date

Axis Debit Card is better. Gives no problem on websites like Steam, Apple Store and Google Play.

All other banks give problems.

thank you!! all