I purchased something with a credit card, and returned it, but it was "lost" in shipping even though they signed for it. It took a while to notice, then it took a while to investigate and then a specified time period had elapsed and my cc company wouldn't reverse the charge. I cancelled the card.
I'll stop blanket recommending credit cards now.
Amex it is.
If there's a wrong transaction with a credit card, the company will 99.99% of the time immediately take your side, and all you have to do is click dispute, and the money is instantly credited to your account.
With a debit card, in the past I have had to go through a week or so long process to get fradulent charges removed.
Plus other benefits, there are perks like automatically extended warranty on purchases like this one (amex), and all sorts of discounts.