Both workflows seem to have the same results so it would be basically up to you which one you want to choose. I was a little thrown off with the word "linestring" because that is a separate tool. I assume you are referring to the Segmented Line Tool correct?
Using the Segmented Line Tool will just create 4 proportionally equal segments on the line. If you want a more precise break-point I would recommend using the Breakline tool. Otherwise, the Segmented Line Tool works fine.