Someone correct me if I'm wrong because my memory is shaky
but chr(10) refers to line feed and chr(13) refers to return carriage.
I don't think it actually matters at least not for drawing text. It is possible it could screw up when saving strings to a file but when you are just drawing in game maker it won't make much difference.
It's just more of a common convention.
I want to split strings in a text document. I found out about the string_split extension, but wasn't sure what to use for new line. Since I need the info in the file, I need to know which of the two I should use.