It would be helpful to know why you are having to make a choice of types of surgery? And I assume your choices are an ileostomy and a j-pouch, not a colostomy or j-pouch?
I had j-pouch surgery for UC six years ago. I have never regretted my decision. In a nutshell if you get the surgery for a j-pouch and don't like it you can always resort to a permanent ileostomy. But if you make the decision to get a permanent ileostomy you can never try a j-pouch.
I exercise almost daily, I backpack, I do 100-200 mile hikes with my j-pouch. My life is fairly normal since surgery. I have gained weight because I am now healthy but I don't mind as I prefer good health to being thin.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free