Correct usage of "The length of time raw query results should be cached" and "The length of time rendered HTML output"

Hi,

Have using views for years but never asked myself, what is the correct usage of views caching

"The length of time raw query results should be cached."
and
"The length of time rendered HTML output should be cached."

I always was putting it exactly the same 5min/5min, so, in which scenarios they should (and need) to differ to get the most performance? I know, that it should be self-explanatory, but it is not at all.

Thank you.