My j-pouch is not functioning well at all now (it was good for 15 year) but I am holding out against going to an ileostomy.
I had a lot of skin irritation when I had the temp ileostomies, even with my best efforts and lots of advice and consultations from a stoma-care nurse. Ouch! I was glad to be rid of that sore ring of skin on my abdomen when I went to the j-pouch. I do have sensitive skin, though. (No actual skin disorders, but my skin gets red and sore very easily.)
I also found that my personality didn't suit the regimen you need to manage an ileostomy (bag changing, skin care, etc.). For some reason, I found it psychologically burdensome. However, many people deal with it just fine. If my condition worsens, I will have to overcome this mental block – not looking forward to that!