Offer your thoughts or opinion on the input financial query or topic using your financial background.

Would I ever need credit card if my debit card is issued by MasterCard/Visa?
If you are solvent enough, and organised enough to pay your credit card bill in full each month, then use the credit card.  There are no disadvantages and several plus points, already mentioned. Use the debit card when you would be surcharged for using the credit card, or where you can negotiate a discount for not subjecting the vendor to credit card commission.