Both are better in their own perspectives. Iron works perfectly on removing wrinkles from thick fabric. However, it can cause burns and damage the fabric as well. Contrary to that, steaming is not meant for de-wrinkling only. Effective steaming has also shown results when it comes to killing bacteria. Not only that, but there won’t be any worries of burns, etc. But, keep in mind that garment steamers are not effective against thick fabric types.