I've officially sampled every kind of Chipotle burrito as of last week. Here is my analysis:
Vegetarian: LOL Barbacoa: Too spicy and slimey. This is shredded beef for you n00bs. Carnitas: This is pork... perfect blend of texture and spice. Mmm. Chicken: Ok, but seems to have lots of gristle in it. Also the cheapest option. Steak: Way too tough. I caught myself chewing individual pieces too often.
In the end, the winner is by far carnitas. That shit is on POINT. If I had to mix it up, I'd fiend off of some chicken. Stay away from the steak, in my opinion.