Which is best for me, submentosplasty only, or submentoplasty + facelift? (Photo)

aka Platysmaplasty after the specific muscle addressed is not enough tot address your concerns. The Platysma needs to be tightened laterally via a facelift incision and the residual skin removed. I suspect from the term sidelaze you cite your doctor is talking about cellulaze. This imo will be inadequate to give you an acceptable result.

I would suggest a subsmas facelift (lower facelift) along with a platysmsplasty (submentoplasty)- you are correct that at this time, you only want to do the procedure once with the best and most comprehensive procedure with the longest outcome. based on your pucture, you have sufficient skin laxity to warrant these procedures. Good luck!

Just from your picture, I would suggest that a facelift, which includes incisions in front AND behind the ear, would be more thorough for you. A submentoplasty would only address the platysma muscle via the chin incision, leaving you disappointed. This is because you would still be left with the issue of loose overall neck skin. The neck skin would be thoroughly addressed with the incisions of a facelift. If you're going to put yourself through the trouble of having an operation, which includes the down time, and the time off from work, etc, I suggest having the more complete operation. Seek a board certified plastic surgeon who is experienced in facelifts. I wish you the best.

I see significant laxity of the lower face and neck. In addition, you experience volume loss due to decrease of facial fat tissues in certain areas. Therefore, I recommend for best outcome face and neck lift with facial fat grafting. 

You are correct in your assessment. Any procedure short of a facelift/necklift with submental repair will leave you disappointed. I am a firm believer in minimally invasive procedures when they will solve the problem but when used improperly nobody wins. Find someone who is willing to solve the problem.

I think a well executed full facelift will give you an excellent result. This takes care of everything from the lower eyelids to the clavicle. The downtime is the same as any miniaturized facelift.

Thank you for the pictures.  I am not familiar with the procedure you are considering.  My recommendation would be a full facelift/neck lift.  Please visit with board certified plastic surgeons for the most accurate recommendations.

Thank you for your question and images. Based on the images you have provided I would recommend a combined procedure elevating the face and neck tissues and removing excess skin. Be sure to review with a Specialist Plastic Surgeon and good luck!RegardsDr Guy Watts

From the photos it appears that you would benefit from a facelift. You have laxity of your skin, jowling, and some flattening of your malar area. A facelift re-elevates the sagging tissues within the face and neck. Excess skin could be removed. Also, you may consider having fat grafting performed at the time of the operation. This can help restore youthful volume to the face. This is commonly injected into the malar area, nasolabial folds, and other areas of the face that would benefit from restore volume.I'd consider additional consultations with surgeons so that you can decide how best to obtain your goals. 

From the photos you have significant laxity which would be best corrected with a full face and neck lift.  When you do just the neck the direction of pull is more horizontal so you don't get as good a correction as when you do the face.  I also agree that if you are going to have the downtime, do the full procedure and get the best result.