Once we have our calorie intake set and we are getting enough protein, the next thing we look at is carbs/fats and micronutrients.
Protein is the most important of the three macronutrients if we want to lose body fat or build muscle. After that then we can be flexible with our carbs/fats to suit our food preferences. e.g some people might like higher carb/lower fat and some people might like higher fat/lower carb.
When it comes to fat loss, the optimal split is the one you can see yourself sticking to!! The amount of carbs/fat that is sustainable and fits in with your food preferences.
To put it simply, if you are eating enough fruit and veg, that will cover most of your micronutrients.