There are two main categories of Borghese Gallery tickets to consider: Self-guided tickets with an audio guide, or tickets that include a guided tour.
If you are visiting the Borghese Gallery alone, or simply prefer art appreciation as a more private and cerebral experience, Borghese Gallery tickets that include an audio guide are probably a good idea.
If you're planning to visit in a group, or are more switched on by in-person commentary, a guided tour of the museum will likely suit you more. Note, there is a difference in price between the various type of Borghese Gallery tickets, so this is another factor to consider when deciding which tickets to buy.