Answer
Synthetic division is better for dividing binomials with a degree of 1.
Work Step by Step
If you look at questions 21 through 28 in this section, you will see that when they are asking you to do synthetic division, they are having you divide a polynomial by a first degree binomial. This is not a coincidence: synthetic division is effective when solving this type of problem.
(Note: This question is asking for the advantages of synthetic division, of which there are many. The answer above gives one of many possible correct answers.)