Mrbluesky,
Welcome to our exclusive club! Sorry for the reason to be here.
To answer directly I am giving you a link to a very good read on the 3 types of diversions:
my.clevelandclinic.org/health/treatments/12546-urinary-reconstruction--diversion
For some reason it won't hyperlink so just copy and paste. For most people their decision of which seems to be well accepted after the fact and surgery. After all, one is choosing life. I have not had to have a cystectomy but, it is always in the back of the mind.
Two quick extras. Radiotherapy, and I think I am understanding you mean this as radiation, is normally not a good option before cystectomy as it often damages some of the tissues used in some of the procedures. Also, be sure to pick a center that does a lot of these. A major bladder unit of a teaching hospital or university setting. Then, you want a surgeon that does at least 25-35 of these a year (or more). Somewhere...and I can't find the link that is considered the threshold for the best experience. What area of te country do you live as someone may have a good reference. For me, it would be MD Anderson as I live in the San Antonio area and it is 2.5 hours away.
Keep posting as you have questions.