Unfortunately, not everything works for everybody. By doing a "Deep Bleaching" process, you may be able to get the enamel AND dentin to lighten. However, whitening of teeth is unpredictable. Some people lighten very well and others not as much.
Generally speaking, if you want whiter teeth, bleaching may satisfy you. If you have a specific level of white you are seeking, bleaching may be a frustrating process for you. Only porcelain crowns or veneers give you the control of the exact level of white you desire. If your enamel is very thin, you may get an added benefit of stronger teeth by placing porcelain on them, so the restorative work has a functional component and not just a cosmetic desire.