They are both sound-wave based systems. Ignore the marketing claims because they both offer modest facial skin tightening with best results usually in people under 60. They work equally well.

However, in my opinion, Thermage is a better technology because it's NOT painful, it's one versus 2-3 treatments for the same results, and it's often less expensive. They are a good option in the summer because there is no sun restriction (unlike many lasers).

See Dr. Irwin's Guide to Thermage for skin tightening, Guide to Eyelid Thermage, Thermage Video Demo

See Dr. Irwin's video on how to find an expert injector.