Answer
Therefore, SO$_2$ has the higher BP.
Work Step by Step
SO$_2$ is a polar compound, while SO$_3$ is non polar. Its intermolecular forces are much stronger than the ones in SO$_3$.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.