Personally I've only tried Southern Biscuits & Gravy and West Coast Truffle Fries. Gotta be honest, the truffle fries flavor wasn't too impressive, but I've never had truffle fries so I didn't know what they were supposed to taste like anyway. The Southern Biscuits & Gravy are the bee's knees.
Edit: Or your favorite flavor of Walker's!
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Dafuq kinda flavours are those! In Canada the weirdest flavour we have is poutine and it was created in Canada