These are the calorie counts of the various McDonald's Snack Wrap varieties available in the US. Taken from McDonald's official online nutrition counter.
Angus Chipolte BBQ Bacon Wrap -- 400 calories
Angus Bacon And Cheese Wrap -- 390
Angus Deluxe Snap Wrap -- 410
Angus Mushroom And Swiss Snack Wrap -- 430
Chipolte BBQ Snack Wrap (Crispy) -- 330
Chipolte BBQ Snack Wrap (Grilled) -- 250
Honey Mustard Snack Wrap (Crispy) -- 330
Honey Mustard Snack Wrap (Grilled) -- 250
Ranch Snack Wrap (Crispy) -- 350
Ranch Snack Wrap (Grilled) -- 270
Mac Snack Wrap -- 330
So, on this basis, the healthiest option out of the above would be to opt for either the Chipolte BBQ Snack Wrap (Grilled), or the Honey Mustard Snack Wrap (Grilled).