I'm 42 years old - What would be better for the skin fold on my neck: FaceTite or Deep Neck Lift? (photos)

Do not even consider a non surgical treatment when you know surgery is your only option. You have some very heavy neck tissues which will not be treatable effectively with a SMAS lift. Your best option is a deep plane lift although this is a difficult problem. It might even require a platysmaplasty which is not usually needed with a deep plane.

Lower facelift and necklift
It is important to understand that the incisions used for achieving a good result in a necklift also give a nice lift to the lower face and jowls. The purpose of a necklift is to pull the extra skin side ways behind the ears and remove it. It is also sometimes combined with Neck Liposuction and Platysmaplasty.
The incision starts in the hair tuft in front of the ear and then curves in front of the ear hidden in natural curves of the ear, then next to the earlobe it goes behind the ear in the hidden groove and finally is taken over to the hairline of the neck.
The skin is then lifted to expose the underlying platysma muscle. It is then pulled back and tethered to the bone behind the ear. At this point the jowl area is also pulled back with stitches under the skin in deeper tissues. These maneuvers lead to excess skin on the sides which is then trimmed and stitched back in place.

Regards Dr. J