For coarse black hair - Alexandrite or Diode? Which is more powerful? (Photo)

I am skin type 3-4 (more 3) and have coarse black hair(coarser on my legs).I understood that the alexandrite laser has 755 nm and the diodes have +800 nm. the longer the wavelength-the deeper the laser penetrates the skin. Is that mean that for coarse hair it would be the best for me to use a diode laser? because it gets deeper to the hair follicles or should I start and finish all my sessions with the 755 nm alexandrite?which is more affective? please explain that to me. I'm confused.

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