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Pei Wei is owned by the creators of Ruths Chris Steakhouse and PF Changs.

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I don't think Ruth's Chris is correct. The PF in PF Chang's stands for Paul Fleming, who started Fleming's steakhouses among other restaurant endeavors. They are based out of here and I think Fleming's are located nationwide now. Pei Wei's are too, I believe. The original location for all three was in or near Downtown Scottsdale. Pei Weis were thought up several years after Chang's as a mid-priced alternative to capture the niche between fast food and fine dining.

I'm pretty sure there is zero difference between the food at PF Chang's and Pei Wei, you just pay extra for the atmosphere at the former.