Cheap vs expensive lash lift

I’m having my first ever eye lash lift soon, but I’m confounded by the range in prices I’m seeing. (Note; I’m in NYC). Higher end med spas are in the 200-250 range while the lower end salons charge around 60-80. Some of the more pricy places say they use gentle, toxin free chemicals for the process, but that’s the only difference I can tell.

You lash lift pros out there: Is there a reason to go pricey on this or is it the same thing? What are your thoughts on the various chemicals they may use? I do have sensitive skin and I generally try to avoid harsh stuff found in a lot of cosmetics and care products. Should I shell out the extra cash for the expensive lift?

Appreciate any advice you may have!