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Sandisk cards are always the best. Unfortunately, there's a huge business in fakes that tries to take advantage of the Sandisk brand without the same level of quality. Make sure to get them in retail packaging, otherwise you're at risk for getting a fake (ex, *don't* get the Frustration-Free packaging on Amazon). I've had good luck getting real ones ordering retail packaged cards from Amazon. Deals sites, eBay, etc, will mostly have fakes.
Class 4 cards usually have the best small chunk read/write speeds, but I don't know if that makes a huge difference. The failure rates for Sandisk class 10 seems to be small, and I don't know that I've seen people complaining about class 6 cards.
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