But you have not done a 40 day pure Water Fast to be able to compare it with a 0-100 kcal 40 day diet which your currently on.
You can only comment on which is better if you have done both, when at similar weight for a similar time at a similar age - impossible hence you will never no if you could have lost extra 10pounds having stuck to just pure water, which is boring but not as boring as losing o.4 lbs aday!