Different procedures. They are two different procedures for two different circumstances. A gingivectomy only removes gum tissue while a crown lengthening procedure requires the removal of bone. You should consult with a periodontist who can clinically examine you, along with your x-rays to properly advise you what is best for your specific situation.
Botox or not. Botox is the least traumatic procedure option. Just 2 properly placed injections can help drastically.