Well, backwash ileitis is not associated with a higher rate of pouch failure:
www.cghjournal.org/article/S1542-3565(11)00795-6/abstractI think backwash ileitis is milder than Crohn's disease. I had a stricture in my terminal ileum; never heard of a TI stricture with UC. I'd seek out a second and maybe even third opinion for something as important as surgery, but my feeling is you probably do have UC.