Is it cheaper to use debit or credit cards in France?

I have done both overseas, my one caution in using the ATM's overseas is be careful. Both uses are expensive when withdrawing cash. The only advantage of the credit card is that if something goes wrong you can stop the transaction. I used my debit in a Rome ATM to get cash and the machine didn't give me the cash but the money was taken out of my account. I contacted the bank before leaving Italy and they replaced the money I lost, but it took some doing and a few hours work on my part. Before you leave the states make sure you tell your credit cards and the bank where you are going for how long because if you don't they will freeze your card.