What is the difference between Venus freeze and Venus legacy?

Could you please elaborate on the differences between Venus Freeze and Venus Legacy? Are they both non-invasive skin tightening treatments? If so, what specific technologies do they utilize and how do they differ in their approach to achieving the desired results? Additionally, are there any notable advantages or disadvantages to choosing one over the other, and are there any factors that might make one more suitable for certain skin types or concerns? Thank you for your insights.