Given the heavy advertising and the marketing out there, I am not surprised that you phrased your question as basically which device will be better for me, rather than which treatment or combination of treatments would be best for me. I have been writing for years cautioning readers about "bells and whistles," "next big thing" machines and products, like fraxels, radiofrequency devices, and PRP, which appear to be far more backed by device and product manufacturer supported marketing and advertising hype than any hard science. Subcision is an excellent means for elevating sunken (depressed, indented, atrophic) scars, but generally two to four treatment sessions are required per scar to achieve optimal improvement and done on multiple levels within the scars. Unfortunately, I need to emphasize that no scar older than three months, from any cause, including those from acne, can be completely eliminated with any current technology, although significant improvement is possible. Like you, the vast majority of people with acne scars typically have a combination of all the major types of acne scars, including boxcar scars, rolling scars, and pit scars. For best results, each type of scar requires its own treatment or combination of treatments.Less expensive tried and true treatments, on the other hand, such as "field subcision," for treating generalized facial atrophy; individual subcisions wtih a biostimulatory filler (for deep rolling and boxcars); TCA CROSS Technique for ice pick scars and very narrow boxcar scars; and medical microneedling for blending any residual, superficial color and texture problems that have followed these other treatments, have been shown to more consistently yield gratifying improvements. A series of superficial peels can help to fade and improve the postinflammatory pigmentary changes that may be present. For more information on these, you may do an internet search under the above terms or check out the archives of RealSelf.com Make sure that you do your due diligence in finding a good board certified aesthetic physician and not simply anyone or any place hawking its latest expensive fraxel or radiofrequency device purchase. Best of luck,