Time permitting, an enema is the more enjoyable and thorough route to have a clean rectum and colon, as far as the water can reach. Add in the pleasure of an enema, the potential sensual side effects, coupled with feeling refreshed thereafter, and it is my preference.
Lacking time, and when the need is there, a suppository can certainly clean out the rectum and maybe a little more, without the mess, and fuss.
In my case, store bought suppositories do not seem as effective as the ones that Mom hid up my butt oh so many years ago. Ssssoooo, having done some research, I developed a recipe, and make my own suppositories. They are as gentle as a lamb, but you will go within 15 to 30 minutes. And, it's all over in less that 1 minute, once it starts; and, there is no mess ~ no fuss.
Now, go out and make it a gr8 evening...