[cnp]

SASS, imo, is a much more mature and interoperable language.

Compare

.mixin (@a) when (lightness(@a) >= 50%) {

   display: none;

}

to

@if $boolean

    @debug "$boolean is #{$boolean}"

    display: block

  @else

    @debug "$boolean is #{$boolean}"

    display: none

Note, also, that there's a logger.

[a_m0d]

How are these two code samples related to each other? They appear to be for completely different use cases, and therefore I'm not sure that they actually demonstrate anything useful.

[cnp]

They are illustrations of two forms of IF statements. One is very weird and hard to use, and the other is... standard.