overall the augmentation is much more than a ZSO, but it doesn't quite make the directly infraorbital rim higher or larger. So overall Sinn's operation is the best as far as both zygoma, malar and orbital rim, but it's not as effective just for the orbital rim, unless you combine an implant and do a canthoplasty as Dr. Yaremchuk does.
For me though, I'd go with Sinn first, then reassess.
Let me tell you this.