Your choice, but hyphenation
Justified text is spaced so the left and right sides of the text block both have a clean edge. The usual alternative to justified text is left-aligned text, which has an uneven right edge. Compared to left-aligned text, justification gives text a cleaner, more formal look.
Justification works by adding white space between the words in each line so all the lines are the same length. This alters the ideal spacing of the font, but in paragraphs of reasonable width it’s usually not distracting.
If you’re using justified text, you must also turn on hyphenation
Justification is a matter of personal preference. It is not a signifier of professional typography. For instance, most major U.S. newspapers and magazines use a mix of justified and left-aligned text. Books, on the other hand, tend to be justified.