Which is more effective for jowls, Thermigen Vs Ultherapy?

While Thermigen most likely does something for the upper layers of the skin (as long as energies are reasonable), it doesn't go down deep enough to get the results that Ultherapy can achieve.  When it comes to non-invasive devices, Ultherapy has the combination of precise treatment and deep results, which are a winning duo.  

There are many other treatment regimens out there, but none that I have ever seen that deliver tightening that is impressive enough to be seen on pictures.  Hope that helps!

I use the Ultherapy system in my Los Angeles office and have found it an outstanding treatment for the lower face and jowl areas. Raffy Karamanoukian, Los Angeles

Ultherapy is a deep focused ultrasound that does not require any use of needles. Thermigen is a radiofrequency energy that is delivered via a cannula through the skin after local anesthetic is injected into the area to be treated. Although there is no suction of fat, the technique of infiltration and then passing a cannula back and forth is similar to liposuction. Swelling and brusing might occur to a greater extent than Ultherapy, but I am not aware of any comparison studies between the two technologies.

Thermigen is relatively new and I have not been exposed directly to this device so I can not comment from personal experience. I am awaiting trusted colleagues of mine who may  have it to inform me of their results once enough months pass to see results and understand better the side effects.