Which fractional laser is best for stretch marks?

Stretch marks a tears in the dermis (the deeper layer of skin) and there is no laser that will fix this.  Lasers for stretch marks are a waste of money.  The Pearl laser is for mild sun damage.  For that, it works very well.

Fractional laser is an amazing and highly effective treatment in our office. We use the laser treatment to help with acne scars, large pores, fine wrinkles, tissue collagen loss, scars, sebaceous hyperplasia, active acne, and for brightening dark pigmentation. Although there are very strong fractional lasers such as CO2 laser, we use lighter treatments for corrective skincare and maintenance of results. Our Thulium fractional laser, clear and brilliant laser, and Ultra Thulium laser are excellent options in our clinic. We also perform CO2 fractional and erbium depending on skin tone and tolerance for downtime. Patients do have to use a Melarase cream before and after treatment to help further reduce pigmentation after laser. Dark spots can improve with these treatments. I recommend fractional laser for incisional scars as well, especially after plastic surgery.

Best,
Dr. Karamanoukian
Realself100 Surgeon

In reality, either of these can help the appearance of strectch marks, but they will never fully remove or conceal them.  The problem is that stretch marks are tears of the skin in the deeper, dermal level.  All of the lasers work superficial to deep, so it is hard to fully ablate stretch marks completely.  The goal is to make their appearance less and blend the surrounding areas in more.  I hope this helps.