This is a good question and one worth asking and finding the right decision for each person.
Here is a link to the discussion which addresses your question:
https://connect.mayoclinic.org/discussion/octreotide-or-lanreotide/
Your NET specialist is probably aware of the NIH (National Institute of Health) study which compares and contrasts Octreatide and Lanreotide. https://pmc.ncbi.nlm.nih.gov/articles/PMC12120025/

After discussing with my NET oncologist I chose the Lanreotide shot. It came down to the NET specialist opinion and my willingness to find out which works better with less side effects for me.
I know that adding Creon to whichever shot, helped with the diarrhea for me, so a discussion with the NET specialist was the best idea. My local Doctor had only given out Ochtreatide but gave me Lanreotide after discussion which has worked out.. I was told that if it did not work, we could try the other..
Wishing you peace of mind and a doable shot with whatever you come to take.