First, both devices combine microneedling and RF and are not lasers. Infini is a powerful skin tightening treatment that is great for wrinkles and laxity in addition to acne scarring. The needles penetrate deep into the dermis, and are insulated, so you do not damage the epidermis-- and thus it is safe on any skin type. The results are dramatic. Skinfinity uses a roller with needles that are not insulated and do not penetrate very deep into the skin. This is more of a surface treatment and is less aggressive than Infini. Either of these devices can be combined with PRP for great results. (The video provided by one of these answers shows PRP and a microneedling pen-- and does not depict either Infini or Skinfinity.)