Hi Grace, Of the two treatments you inquired about, Morpheus8 is the better option to tighten crepey arms. I have done this treatment on arms and not only does the skin tighten, but the skin texture amd time also improves. Individual results do vary and it depends on your starting point so it is best to consult with a trusted provider. I have also used Morpheus8 on other typically difficult and flabby parts of the body that needed a little tightening and toning with great results.
