These are the two gentlest fractional lasers in common use, and they compete for the same appointment: a low-downtime treatment for dullness and early sun damage.
Both are non-ablative and fractional, meaning they treat the skin in microscopic columns and leave the surface intact.
The honest summary: they are more alike than different. Which one you are offered usually reflects which device the clinic owns.
One wavelength, 1927 nm.
1440 nm for texture, 1927 nm for surface pigment.
Honestly: by provider, not by device. Both are well-established, both are gentle, and neither has been shown to beat the other in a head-to-head trial, because no such trial exists.
Two things worth asking:
These are gradual treatments. Neither produces the kind of change people post before-and-after photos of after one visit. What they do well is lift surface colour and improve how the skin catches light, cumulatively, over a course.
If you are expecting one appointment to change your skin, you will be disappointed by both.
If you get cold sores, tell your provider. Either treatment can reactivate the virus, and antiviral medication started in advance is the standard precaution.