Lightsheer or Soprano XL for Medium Blonde Hair?

My skin is light but not ivory. It's light but I am not very sensitive for the sun (like people with light skin and red head). My hair are rather blond than dark, but not white. I was using for the first 2 treatment Lightsheer (I was satisfied). Unfortunately I had to moved to neighborhood where only Soprano XL is available.After 2 Soprano sessions, so 4 in total, I lost 50% of all hair. Is Lightsheer better for me?Soprano effects are not impressive. Is there a difference between these 2 lasers?