Which cloud produces the most rain?

Question

Which cloud produces the most rain?

Answer 1

"There are two cloud appearance types: cumulus and stratus, which are also the basic names of the low clouds.  Sometimes they appear higher in the atmosphere and get a combination name with a prefix.  For example, middle cumulus clouds are called “altocumulus” and high stratus clouds are “cirrostratus.”  If a cloud produces rain or snow it gets either “nimbo” at the beginning or “nimbus” at the end. "

" A cumulonimbus cloud is tall, deep and dark and can bring lightning, heavy rain and even severe weather such as hail, damaging winds or tornadoes.  It is a sign of rapidly rising and sinking air currents."

Answer 2

It has been my experience that rainclouds produce the most rain.

Answer 3

Cumulonimbus clouds  

Answer 4

Black ones. The density of clouds is shown by the light transferred through them.