Why this site does not rank the two devices
Comparison pages usually end by naming one option as the answer, and this one will not. The two devices deliver their energy differently, and that difference favours one of them for some targets and not for others. A Q-switched laser is not an outdated version of a picosecond laser; it is the instrument that clears a great deal of surface pigment and ink, and it has been doing so for a long time. The two columns here carry the same weight, and each device is given the same honesty about what it cannot do.
What that changes about the writing
Every guide is written as pairs of facts rather than as a scorecard. There is no highlighted column, no tick or cross, and no star rating. The guide on the pigment change a Q-switched device can cause is matched by one on the pinpoint bleeding and purpura a picosecond device can cause, and neither is softened to make the other look safer. The cost guide explains what drives a total without quoting a figure, because a figure on a website is not a quotation for your skin.
How it is reviewed
Content is medically reviewed by Ke He, MD, Deputy Director of the Plastic Surgery & Aesthetics Medical Center and head of skin and laser aesthetics at Chongqing West District Hospital, and the review date appears on every article. The site names no device brand and no drug brand, quotes no wavelength, no dosage and no price, guarantees no outcome, and states plainly that pigment recurs and that a lesion that has not been identified should not be treated.
What no website can do
It cannot tell you what the mark on your skin is, how deep it sits, whether your skin type tolerates the energy, or whether the correct advice is not to treat it at all. Those answers require an examination, and in some cases a sample taken and looked at. Read this site to arrive at that appointment able to ask sharper questions, not to arrive at a conclusion without it.