You can gather candidates and test them in your edit before you spend anything.
Try before you buy
Download a free watermarked version of any track and drop it into your project to check the fit. You only license once you are sure it works.
Shortlist with Projects and Favorites
Save tracks to Favorites to come back to them, or gather candidates for a specific job in a Project (a private collection). It keeps your options together while you decide - handy when you are choosing with a client.