Would I benefit more from a sliding genioplasty or a chin implant? (photos)

Without an exam your question cannot be answered.  You will need to see an Oral/Maxillofacial surgeon to see if othognathic surgery, genioplasty or using an implant is best for your specific case. It should be noted that patients with severely weak jaws or abnormally functioning jaws may be better treated with other facial surgery (orthognathic surgery), although a chin augmentation may be an option at a later time. These patients should seek the advice of a plastic surgeon to determine which course is right for them. Here is some information to help you make this decision: Candidates for Chin Augmentation - Patients whose chin profiles are weak but have normally functioning jaws are candidates for Chin Augmentation. Many of these candidates have used injectable fillers in the past to strengthen the protrusion of their chins, but are looking for a permanent solution. If you are one of these patients, then you are a likely candidate for chin augmentation

Never ever recommended a chin implant, they are unstable overtime, lead to poor results in many cases, are unconfortable or painful, and of course their lifetime as implants is limited in time. For those reasons and other the osseous genioplasty (beware! calling it sliding genioplasty is an abundance of simplification, since you can not only "slide" the chin) is the choice, outweighing the implants in all fields. 
As mentioned before, the osseous genioplasty is a very versatile technique, allowing to slide, augment or reduce the 3 dimensions of a chin; that is why there are one, two and three-dimensional genioplasties, and they can be of advancement, reduction or augmentation, even mixed combinations of the formers. In good hands the results of osseous genioplasties are awesome, natural, everlasting and safe.
This is particular relevant in your case, and very easy to understand even for lay observers; your chin suffers overall microgenia or hypoplasia, this means it is too small in all them three space dimensions: too weak anteriorly, too short vertically and too sharp/narrow horizontally, thus needs a three-dimensional augmentation to lenghten vertically, broaden horizontally and advance anteriorly, namely a full expansion, to which bone grafting is required, with spectacular results. If only an advancement sliding gesture is done you'd get a weird, fake and too sharp result; needless to say just a chin implant would be disastrous. Additionallhy the horizontal broadening would provide restoration to the missing fullness and both sides of the chin, and mascunilize your look, as well as preventing a witche's chin (over sharp).
Finally, let me suggest a combined nasal procedure, it seems you have a shor-nose syndrome in need of nasal lengthening (septal extensions, caudal extension grafts, etc), and an overly rotated tip needing lowering of the nasolabial angle.
Yours is a master's case, requiring top notch skilled surgeon, expert in such specific procedures (three-dimensional augmentation genioplasties and nasal lengthening are difficulty 9 out of 10 in primary cases), used to deal with facial plastic surgery and with a very good aesthetic judgement; do research well.Note: unless some surgeons may believe, osseous genioplasties do have no connection or effect on dental occlusion issues, for such problems exists the orthognatic surgery, such is a basic conceptual confusion requiring knowledge refreshment.

Given your young age, degree of horizontal and vertical chin shortness and your deep labiomental fold, a sliding genioplasty would be a preferred choice over an implant in the long-term. The only missing piece of information in your case is what you look like in the front view which is also an important perspective for chin augmentation as well as the effect of a sliding genioplasty and a chin implant will be different.

A sliding  Genioplasty is usually performed for patients who have dental occlusion issues. A sliding  genioplasty is performed under general anesthesia by an oral surgeon in a hospital setting with an overnight hospital stay. It is more invasive.  A chin implant procedure is performed under local anesthesia which takes approximately 30 minutes and cosmetically augments the chin forward. A chin implant will not help with any dentition issues. Chin implants are manufactured in a large variety of sizes and shapes, and can be custom carved according to the patient's unique anatomy. In our practice, we use solid silicone Implantech anatomical chin implants for the last 25 years. Digital computer imaging would be helpful to understand what H&M plant can accomplish. For more information about chin implants, many before-and-after examples, and diagrams of the implants themselves, please see the link and the video below

 Hi, I have performed many facial shaping procedures using dermal fillers, facial implants (cheek, chin), liposuction and/or facelifts for over 30 years. Following my  beauty principles, men look chiseled and handsome with angularity in the cheeks, chin and mandibular angles.  The attached photos show cheeks that are flat in the front, a chin that is weak along with weak mandibular angles. 
 You may want to create facial angularity with these procedures. 
*Augmentation of the Cheeks  with cheek implants or a dermal filler. 
*Chin Augmentation with a chin implant which adds projection to the chin creating harmony and balance to the lower face.  I perform chin implant surgery in 30 minutes or less, often using a local anesthetic alone.  In my opinion, you are a good candidate for chin implant surgery.
*  Jaw Line Augmentation of the mandibular angles using a dermal filler (jaw implants have too many unwanted side effects IMHO) to add volume, angularity and flare to the jaw line.
Hope this helps.

a sliding genioplasty is more ideal for you since you have to avoid the deepening if the labiomental fold between the lip and chin. As well if you wish to.imorove the symmetry you could augment the side of the jawline which is less defined. Contouring jawline implants as opposed to a chin implant do help define the jawline nicely