In my 70 years, I have had 4, and used all of the preps over those times. Drinking the gallon of Colyte prep the first time. Then the Fleet enemas for the second along with bisacodyl tabs, third time was Citrate of magnesia with bisacodyl tabs. This last time, I used a new prep process called Sutab by prescription from the Doctor. It is BY FAR the best and easiest way to go. You take some of the tabs with water, then an hour later more tabs. After that you take a total of ten tabs, 2 at a time with a sip of water every couple of minutes (can't recall how long). Then the BM starts, lasts about 5 minutes, then it's over. I didn't stay on the toilet all night long, every 15 minutes like the other preps. Then I took a couple tabs 4 hours before (??) the prep, and that was it. No sore/raw exit hole, no "accidents", and everything was easy peasy.
At the facility, nurse started IV, then said "you are going to feel a little sleepy", and she injected Propafol into the IV. Next thing I remember, I was in recovery with Nurse stating "Everything was fine, you should be ready to get dressed in a few minutes". Wife then drove me home. A week later, Wife did the same with the same prep. She agreed it was the best and easiest prep ever.