Honestly, that is up to personal preference. We personally prefer thin scallion pancakes because they are crispy and flakey on the outside and tender with just enough chew on the inside. Thicker scallion pancakes, are still flakey and crispy on the outside, but tends to be a bit doughier and chewier on the inside. Also, thicker pancakes require longer cooking time, so you'll have to cover the pancakes with a lid, while cooking, to ensure that they are thoroughly cooked.