I'm a Trader Joe's fan who shopped at Costco for the first time. I get why members are so loyal, but I'm not convinced — yet.

I'm a Trader Joe's fan who shopped at Costco for the first time. I get why members are so loyal, but I'm not convinced — yet.

Costco and Trader Joe's provide very different shopping experiences.Daniel Pockett/Getty Images, Robert Alexander/Getty Images <ul><li>As an adult living in the US, I usually buy groceries at Trader… [+8301 chars]

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