I'm 44 years old & I'm planning to do nefertiti or silhouette lift. Which is the best? (Photo)

A full face and neck lift will give you the results you want, nicely contoured mid and lower face and neck.  Based on your photos there are no good minimally invasive options to address your concerns. 

In my opinion, based on your photos, nothing short of a well done neck lift will address the problem.  It's OK not to have the right treatment, as long as you don't expect real results.  Be sure to discuss with your own surgeon about how this applies to you, and whether they have any special concerns in your case.