There is a difference! I only use complex carbohydrates in my snacks because oats are super beneficial to anyone's life. I just found a way to make it yummy. Enjoying food is key to a happy and healthy life.
1) Neither is an enemy.
It's mainly just including more complex carbohydrates than simple in your life can help you to better balance your health!
2) Simple carbohydrates break down very quickly.
All simple carbohydrates spike your blood sugars faster than complex carbohydrates. This is because of the dietary fibre in the complex carbohydrates e.g. whole wheat bread vs white bread which is like a simple carbohydrate.
3) Carbohydrates are essential for survival.
You can't live a happy and healthy life without balancing the macronutrients (carbohydrates, fats, protein) and micronutrients (vitamins and minerals).
Don't listen to misinformation that makes you restrict yourself because this is what creates an unhealthy relationship with food! You'll have excessive cravings and cause other health complications through restrictive diets and weight loss gimmicks. Be aware.
Get the guidance you need.