Both use ultrasound to stimulate collagen and tighten skin without surgery, but they work at different depths.
Ultherapy
Reaches deeper layers and suits jowls, neck laxity and brow lifting.
Sofwave
Works on the mid-dermis and suits fine lines and mild laxity, with a comfortable session.
The choice depends on the degree of laxity, skin age and the result you want, and is made in consultation.