It depends on a number of factors, but generally speaking, fat transfer is more versatile and can be used to correct a wider range of issues. However, implants tend to result in a more natural looking result with fewer complications. Your best choice will depend on what you're hoping to achieve and your body type. If you're looking for more volume in your breasts, fat transfer may be recommended, and if you're looking for permanent results that look and feel more natural, implants are recommended.