The Obesity Society meeting in LA in Nov. 2015 allows a variety of diets to lose weight

It basically comes down to 4 types of diets.

 Low Carbohydrate High Fat

Low Fat diet

Mediterranean diet 

Vegetarian diet

This is what 3 of those diets actually were in the Shai head to head trial link

Look at these 3 diets and choose which one you can stay on for the rest of your life when you have to maintain your weight loss because it will be the same number of calories. 

EAL slides from Weight Maintenance Lecture at TOS LA 2015