Lasers are most selective and more effective at absorbing into melanin, meaning fewer treatments are required.
There has been more published clinical evidence to support effectiveness of laser treatments.
Lasers penetrate deeper into tissues to specifically target hair structures. Alex 755nm, NdYAG1064nm and Diode 810nm penetrate approx 4-5mm specifically design to target hair structures, while most IPL’s only target 2mm which is not deep enough to target these structures effectively.
Lasers have more advanced cooling systems meaning more comfortable treatments.