I just won a gift card; Help me decide which one to get!

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At a cool site called winzy, one of my referrals won a gift card. The cool thing about winzy, is if any of your referrals win anything, you win the same prize! So, I won a gift card valued at 10 dollars. I can choose between an amazon gift card or an itunes gift card, but I cant decide! What would y'all choose? By the way, if any of you are interested, here is the site: http://www.winzy.com/quadium32