What is the difference between Thermitight and a laser lift? (photos)

I have seen videos of both Thermitight and laser lift being done. The procedures appear to be very similar. Is there a difference in effectiveness? How about pain or downtime? I would very much like to avoid an actual surgical procedure, because of difficulties I experienced with general anesthesia several months back. I am 49 years old and my skin itself is not in bad shape, but the sagging chin and neck seem to be hereditary. Would you recommend lipo first, then one of the above treatments?