One thing about diets that focus on one aspect is that the food industry is always quick to mess them up. When low fat was proposed people did great, until the food industry noticed and started make low fat food that had so much sugar that low fat often had equal or more calories than regular! Same thing happened with Atkins, and I see it happening now with Gluten free. I'm doing high fiber and it's unbelievable how many garbage foods are now touting fiber because they've been fortified with fake fiber.
And soon the grocery shelves will be full of low carb foods that contain tons of added fat and low carb will seem to stop working.
So I think you should pick a plan that works for you, but that you will always have to keep an eye on calories, just to protect yourself.