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Jack in the Box is second. It's not as spicy and the chicken is not quite as nice a texture. It's not as big, but it will do.
Chick-fil-a is third. Quite spicy, but a little dry. Also, who puts pickles on a chicken sandwich.
Burger King will always come in last. Why? Because the chicken isn't spicy. The only thing that makes it a spicy chicken sandwich is the sauce. And I DON'T like sauce. So, they lose.
McDonald's has a new spicy chicken sandwich, which I have not tried. It will soon be seen where it falls on the continuum of superiority for spicy chicken sandwiches.