The former is a block quote the later is a spoiler. There is also preformatted text, which might qualify. It looks like this.
This is preformatted text. It is especially useful for code.
You can get it by indenting the text with four spaces.
A feature or issue with this is that it will not break you lines, but instead will add a slider. Like this.
This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. This line is very long. Really it is.
Another difference is that it uses a mono spaced font. I think the main use case is for including pieces of code. Something similar can be obtained using backticks like this
. For this one has to put (`), without the parenthesis, at the beginning and at the end. Note it must not be confused with ('), which has no particular function.