Many of us can be extremely different then "the average", so it is impossible to say that one single way of cleansing bowel is any better then the other.
That is why there is no such a thing as "The Best" bowel cleanse.
Every person with experience in cleansing bowel have his/her idea of what "The Best" Bowel Cleanse could be. Every person is different, every person may need some variation - something that is just specific for him/her. Just like with diet.
THERE IS NO ONE SINGLE DIET THAT WILL ORK FOR EVERYONE!
You will have to find what way of cleansing is the best for you! Some people prefer enema, other prefer herbal cleansers, other prefere just better diet, or a lot of probiotics, or colonics, or any combination of those, ... some people hate enemas, some poeple hate herbal remedies, other are allergic to any yogurt culture, some people can not tolerate psyllium, or bentonite, or are allergic to herbs ....
Not every cleanse is good for every person. Prices for herbs are different, and recepies are differnt, and strength is different. We are different. You can not make simple comparations, and you can not generalize!