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Hi KC.
Really and truly, it is like comparing ethylene glycol to methanol. Both are No Bueno.
I think when it comes to this specific recipe, go with what gives better mouth feel, and taste pleasure. Maybe it might be worth considering how to make the wrap/burritos tasty and healthier.
gram for gram, lard will have more trans, and saturated fat as well as environmental pollutants.
However the Butter will have more female sex hormones.
Enjoy, and stay safe.