Hamamatsu publishes a nice deck of slides from its LiDAR webinar on Dec 6, 2017 " LiDAR and Other Techniques, Measuring Distance with Light for Automotive Industry " by Slawomir Piatek. The 66-page presentation compares 905nm vs 1550nm bands, mecanical vs MEMS vs OPA scanning, flash, and FMCW approaches, and much more: