About five years ago I underwent a total colectomy for torrential diverticular bleeding. This was not done laparoscopically - but via the "surgeon's hands inside the abdomen" or however indelicately you want to describe it!!
In response to another Medhelp patient's question, I recorded my experience on:-
http://www.medhelp.org/posts/show/523166
You may find this useful - and perhaps you could print it off and ask your surgeon(s) whether he/she would regard my experiences as typical of what you might expect.
I can't answer your question about which operation (straight down - or right angle etc etc) is preferable but I do think you should ask the surgeon for his/her opinion and especially whether the "geometry" of the intestinal join (= anastomosis) will have any bearing on your recovery - including the risk of future soreness/obstruction etc etc
regards
Morecambe