Regular vs. Supreme
I'm a "regular" guy with the Nacho Cheese original; the sour cream and tomatoes only mute the ambrosia that is the Doritos powder. Here, though, supreme makes sense, because the sour cream and tomatoes' acidity cut through the spice. Those elements work better with chicken than beef. Also, again... tongue of a 4-year-old girl.
Original Nacho Cheese vs. Spicy Cool Ranch Chicken
No contest. Nothing in the world is better than Nacho Cheese Doritos. Even in taco form. Period.
The new chicken DLT is a step up from its Cool Ranch beef counterpart, with the ranch flavors are more pronounced and pair much better with chicken than cow. However, nothing can, or will, ever trump the original. But if you're getting a taco 12-pack, it's definitely worth throwing a couple Spicy Chicken Doritos Locos Tacos into the mix for a little variety.
Andy Kryza is a senior editor on Thrillist's food and drink team and just fell off the wagon in his Taco Bell rehab. Follow him to to recovery via @apkryza.