What matters is eating a small enough amount of carbohydrate to enter ketosis, so that your body can become fat-adapted. On these forums, we recommend eating less than 20 grams a day, but Dr. Stephen Phinney, who coined the term “nutritional ketosis,” talks about people entering ketosis while eating 100g or even 125g a day. So there is obviously some wiggle room for a lot of people. Here, we advise only 20g, because it’s a level at which anybody will most likely enter ketosis, no matter how insulin-resistant.
So do what works best for you. If you do net carbs and have trouble getting into ketosis, then switch to total. If you’re fine with 20 net, then once you’re fat-adapted you can experiment with eating a bit more and seeing what happens. The goal is to get your carb consumption down to a level at which your insulin will be low enough to allow your body to manufacture ketone bodies from your stored fat.