Rectal cancer

Hi

Just been diagnosed with rectal cancer following a colonoscopy and MRI . I have large polyp in the lower rectum and cancer in the bowel lining but nowhere else. I'm awaiting a date for an op but have to decide whether to have an ileostomy or colostomy. Because its so low in the rectum a reversal might  be problematic and at 79 I'm not sure I want to risk the 20% chance of a reversal leaking and another operation down the line and also the fact the rectum will be very short with little capacity. I'd be grateful to hear of anyone else experiences.

TIA