There are different actions for these two treatment options:
1. Ulthera has been referred to as a non surgical face lift. The device is the only one that is FDA approved to "lift" skin. The treatment is focused sound waves that cause thermal coagulation of very precise areas. It is the only device that can target the superficial musculoaponeurotic system (SMAS), the deep facial layers that the plastic surgeons undermine and tighten during a face lift. Ultherapy is wonderful for lifting and toning the forehead (brow lift), cheeks and neck. It is a dual plane treatment and will cause significant thickening of the dermal layer of skin. It does not, however, produce dramatic volume of the face. I believe Ulthera is much better than RF for the face and RF can not treat the SMAS.
2. Sculptra is a means to replace volume. Part of the aging process is loss of facial fat, thinning of bone, such as the jaw and zygomatic arch and broadening of the orbit, resulting in sagging (jowls and wattles). Sculptra is a long-term treatment, lasting for years. Injecting this filler into the temples, cheeks and many other facial areas, can replace volume, resulting in a much more youthful appearance.