Chin Implant Vs Sliding Genioplasty

I'd like my chin/jaw to look stronger. It sounds like there are two possible solutions: Implant: This would add more projection, but not height. Some implants extend along the jaw (Mittelman prejowl chin implant). Would this improve the chin/jaw's strength without lengthening the chin's vertical height? Sliding Genioplasty: This would involve cutting the chin bone and repositioning it. This could be used add vertical height to the chin, but I wonder if additional height is even necessary to achieve my goal of a stronger chin and jaw. When is it preferable to choose an implant over sliding genioplasty?