How about double chin advancement?

I went to two hospitals a few days ago, and I was confused because the diagnosis results were different.
 
First of all, both hospitals said that I had a severe chin (more than 1.4 cm of advancement was needed to achieve the ideal ratio) and that my chin was long, but
 
one of them said they had to cut out the bone. Instead of reducing it, adjust the angle of the osteotomy to slightly adjust the length + (6mm+6mm) Fat grafting for the part that is insufficient for the two-stage advancement, and
 
6mm+length reduction + secondary angle adjustment for the other part.
 
​First of all, as it is, my chin is too stressful, so I definitely want to remove it. It's just my heart, but since I have a long chin, I'm anxious about double-step forward, and I've seen a lot of reviews of double-forward failure at other cafes... However, I can't make a choice because it seems like the chin will be almost the same just to remove 6mm. Qㅠ ​Please
 
let me know what it was like if you tried to double advance in a case where the chin was severe, or if you just advanced double.